Why did the Social Security Bureau detain it for two months?

There is no law requiring a worker to pay social security for three months for the first time. Where a laborer establishes a labor relationship with an employer, the employer shall pay social security for the laborer according to law. It is unreasonable for the employer to deduct the personal part of the employee's three-month social security at one time. Usually it belongs to the illegal operation carried out by the employer for the convenience of its own internal operation. Workers can complain to the social security bureau where the employer is located. You can also apply for labor arbitration to the workers and arbitration committees where the employer is located.

Social insurance law

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.

If the employer fails to pay or repay the social insurance premium within the time limit, the social insurance premium collection agency may inquire about its deposit account in banks and other financial institutions; And can apply to the relevant administrative departments at or above the county level to make a decision on the allocation of social insurance premiums, and notify their bank or other financial institutions in writing to allocate social insurance premiums. If the balance of the employer's account is less than the social insurance premium that should be paid, the social insurance premium collection agency may require the employer to provide guarantee and sign a deferred payment agreement.

If the employer fails to pay the social insurance premium in full and fails to provide guarantee, the social insurance premium collection agency may apply to the people's court for sealing up, distraining and auctioning the property whose value is equivalent to the social insurance premium that should be paid, so as to offset the social insurance premium with the proceeds from the auction.

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