Is it reasonable for the unit to stop social security privately?

Legal analysis: No, it is illegal for the employer to unilaterally decide to stop paying social security before the employee terminates the labor contract relationship. Workers can complain directly to the local labor department, and the labor administrative department shall order them to make corrections and give them a warning; If it causes damage to workers, it shall be liable for compensation. Laborers may also apply for arbitration or bring a lawsuit according to law. Defend one's legitimate interests.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 4 Employers and individuals in People's Republic of China (PRC) shall pay social insurance premiums according to law, and have the right to inquire about payment records and personal rights and interests records, and ask social insurance agencies to provide social insurance consultation and other related services. Individuals enjoy social insurance benefits according to law and have the right to supervise the payment of their own units.

Article 63 If an employer fails to pay social insurance premiums in full and on time, the social insurance premium collection agency shall order it to pay or make up within a time limit. When workers find that employers have irregular practices, they can protect their legitimate rights and interests through legal channels in time.