Does the company have the obligation to purchase social security?

Yes, paying social security is the legal obligation of employers and workers. Employers do not pay social insurance premiums for workers, but pay so-called social security subsidies in cash, which is illegal and cannot exempt employers from their statutory payment obligations. Even if there is an agreement between the two parties or the employee voluntarily gives up participating in social insurance, which is illegal and invalid because it does not meet the legal requirements, the employer shall still fulfill the obligation of payment.

Social security is compulsory insurance, and employers must buy it for employees. The employer shall pay social security for the employees within one month after their employment. Even if employees don't want the company to buy social security or agree in writing that the company doesn't buy social security, it is illegal for the company not to buy it. If the company does not purchase social security or fails to pay social security according to the actual salary, employees can ask the company to pay social security for these two years. However, employees apply to the Arbitration Committee for arbitration and ask the company to pay social security. The arbitration commission thinks that this matter is not within the scope of acceptance of the arbitration commission and will not be handled.

To pay social security, the company has to pay the company share, and the individual has to pay the personal share.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.