How to apply for a German tourist visa as a self-employed person?

Hold business license, ID card and household registration book.

On-the-job certificate is only an auxiliary certification material for visa application. Holding a business license and ID card can prove occupation. If the legal person of the business license is not himself, it can also be signed by the legal person to prove that he works there. Westerners generally believe that signature is a valid certificate.

Don't care too much about the work permit. Visa officers are concerned about whether they are inclined to emigrate, so they hold real estate such as houses, high-amount bank bills, round-trip air tickets, etc. (You can do without them, but if you carry them with you, your visa will be smooth, but if you are found to have forged entry, you may be refused entry. Last year, you reported a case of being refused entry in Britain), reasonable itinerary (such as detailed travel itinerary with a group tour), and even education and age (older people are more relaxed).