Is it illegal to secretly post your own red envelope code in someone else's shop?

It is an illegal act and is suspected of theft, which will seriously violate the criminal law.

According to the People's Republic of China (PRC) Public Security Administration Punishment Law:

Article 49 Whoever steals, swindles, robs, robs, extorts or intentionally damages public or private property shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan; If the circumstances are serious, he shall be detained for more than 10 and less than 15, and may also be fined less than 1000 yuan.

According to the provisions of the Criminal Law of People's Republic of China (PRC):

Article 264 Whoever steals a large amount of public or private property, or repeatedly steals, enters a house, carries a weapon or pickpockets, shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also, or shall only, be fined;

If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated.

Extended data:

According to Article 1 of the Interpretation of the Supreme People's Court and the Supreme People's Procuratorate on Several Issues Concerning the Application of Laws in Handling Criminal Cases of Theft:

Whoever steals public or private property in an amount of more than 1,000 yuan but less than 3,000 yuan, more than 30,000 yuan but less than 100,000 yuan and more than 300,000 yuan but less than 500,000 yuan shall be deemed as "a large amount", "a huge amount" and "a particularly huge amount" as stipulated in Article 264 of the Criminal Law.

The higher people's courts and people's procuratorates of all provinces, autonomous regions and municipalities directly under the Central Government may, according to the local economic development and the situation of social security, determine the specific amount standards implemented in their respective regions within the scope of the amount specified in the preceding paragraph.

Report to the Supreme People's Court and the Supreme People's Procuratorate for approval. Theft on cross-regional public transport means, the location of theft cannot be verified, and the amount of theft reaches "a large amount", "a huge amount" or "a particularly large amount".

It shall be determined according to the relevant amount standards determined by the higher people's courts and people's procuratorates of the provinces, autonomous regions and municipalities directly under the Central Government where the case is accepted. Stealing contraband such as drugs should be treated as theft and punished according to the seriousness of the case.

According to Article 2 of the Interpretation of the Supreme People's Court and the Supreme People's Procuratorate on Several Issues Concerning the Application of Laws in Handling Criminal Cases of Theft:

Theft of public or private property, under any of the following circumstances, the standard of "large amount" can be determined in accordance with the standard of the preceding article:

(1) Having received criminal punishment for theft;

(2) Having received administrative punishment for theft within one year;

(3) Organizing and controlling theft by minors; (4) Theft in the place where the incident occurred during emergencies such as natural disasters, accidents and social security incidents;

(five) theft of property of the disabled, the elderly and the disabled;

(six) stealing the property of patients or their relatives and friends in the hospital;

(seven) theft of disaster relief, emergency rescue, flood control, special care, poverty alleviation, immigration, relief funds and materials;

(eight) serious consequences caused by theft.

According to Article 3 of the Interpretation of the Supreme People's Court and the Supreme People's Procuratorate on Several Issues Concerning the Application of Laws in Handling Criminal Cases of Theft:

Theft for more than three times within two years shall be deemed as "multiple thefts". Whoever illegally enters the house for the family life of others and steals from the outside world shall be deemed as "burglary".

Anyone who steals equipment such as guns, explosives, controlled knives, etc., which is prohibited by the state from being carried by individuals for the purpose of committing illegal crimes, or steals other equipment that can endanger the personal safety of others, shall be deemed as "theft with a murder weapon".

Whoever steals property carried by others in public places or public transport vehicles shall be deemed as "pickpocketing".