Opening a prefabricated vegetable factory needs to comply with the national laws and regulations on catering services and obtain relevant licenses. The following documents and qualifications may be required:

1. Business License: You need to register with the local administrative department for industry and commerce and get a business license.

2. Food production license: Prefabricated vegetables belong to the category of food processing, and it is necessary to apply to the local food and drug supervision and administration department and obtain a food production license.

3. Tax registration certificate: you need to register with the tax authorities and obtain a tax registration certificate.

4. Enterprise safety production license: The production of prefabricated vegetables involves fire, gas and other safety issues, and it is necessary to apply to the local safety production supervision and management department to obtain the enterprise safety production license.

5. Employee health certificate: The production of prefabricated vegetables needs to ensure the health of employees, and it needs to be inspected by the local health and epidemic prevention department and obtain the employee health certificate.

In addition, according to local policies and regulations, it may be necessary to apply for other certificates and qualifications, such as licenses and certificates in environmental protection, fire protection and quality management. Therefore, it is suggested that before opening a prefabricated vegetable factory, you should first understand the relevant laws, regulations and handling procedures from the local area to avoid unnecessary troubles.