About Beijing social security transfer out and then can be transferred back again?

Yes.

The Interim Measures for the Transfer and Continuation of the Basic Pension Insurance Relationships of Urban Enterprise Employees have corresponding provisions:

Article 4? If the insured person has not returned to his place of domicile for employment and insurance, the social security agency in the new place of insurance will handle the transfer and continuity procedures for him in a timely manner. However, for men who have reached the age of 50 and women who have reached the age of 40, they should continue to retain the basic pension insurance relationship in their original place of participation.

At the same time, a temporary basic pension insurance contribution account shall be set up in the new place of participation to record all contributions made by the unit and the individual. When the insured person moves across the province for employment again or meets the conditions for entitlement in the new place of insurance, the principal and interest of all the contributions in the temporary basic pension insurance contribution account will be transferred and pooled to the original place of insurance or the place of entitlement.

Expanded Information:

The Interim Measures for the Transfer and Continuation of the Basic Pension Insurance Relationships of Urban Enterprise Employees:?

Article 31 Urban residents enjoying the minimum subsistence guarantee for urban residents and enjoying the urban residents' living difficulties subsidy treatment may, after enjoying the basic medical insurance treatment for urban residents, continue to apply for the medical assistance for urban special hardship cases from the civil affairs departments if they meet the conditions for medical assistance for special hardship cases.

Urban senior citizens who have lived in foreign cities for more than one year, and students and children who live or study in foreign provinces or cities and do not participate in the basic medical insurance for local residents, should apply for registration for medical treatment in a different place at the social security office where their household registration is located.

Article 32: Disabled military personnel in grades 7 to 10, urban beneficiaries, and retirees and old activists who are entitled to medical treatment in accordance with the medical assistance scheme for persons in special hardship in urban areas shall be entitled to basic medical insurance for urban residents.

Baidu Encyclopedia - Interim Measures for the Transfer and Continuation of the Basic Pension Insurance Relationships of Urban Enterprise Employees