How many times can the same person's social security increase or decrease a month?

Twice. There is a limit to the number of social insurance additions and subtractions per month. According to the provisions of Article 66 of the Social Insurance Law of People's Republic of China (PRC), "social insurance agencies shall, in accordance with the provisions of the social insurance administrative department of the State Council, regularly register the increase or decrease of social insurance with the insured units that pay work-related injury insurance premiums. The number of people who increase or decrease every month shall not exceed the scope stipulated by the administrative department of labor security. " There are restrictions on the monthly increase or decrease of social security personnel, and operations beyond the scope stipulated by the administrative department of labor security are not recognized.