Is it illegal to find a human resources company to pay social security?

It's not illegal. This is called social security, and social security is paid in the form of social security. There is actually no labor relationship between individuals and institutions. The employing unit shall pay social insurance for the laborer after establishing labor relations with him. Although the Social Insurance Law requires workers to establish a labor relationship with their units before they can pay social security, social security handling is also a personnel outsourcing business, and social security business can be paid by a third party.

Legal objectivity:

Article 72 of the Labor Law of People's Republic of China (PRC) stipulates that the social insurance fund shall determine the source of funds according to the types of insurance, and gradually implement social pooling. Employers and workers must participate in social insurance and pay social insurance premiums according to law.