Can the social security card be used as an ID card to stay in a hotel?

You can't. Social security card only has some functions of ID card, so it can't be used as ID card. The identification function of social security card refers to the identification of enjoying public employment services, employment support policies, insurance registration, payment declaration, social insurance relationship transfer, medical expenses reimbursement, treatment qualification certification and other services.

legal ground

Measures of the People's Republic of China for the Administration of Social Security Cards Article 2 The social security cards mentioned in these Measures refer to integrated circuit cards issued to the public and mainly used for government social management and public services in the fields of human resources and social security. Social security card is a electronic certificate for cardholders to enjoy the rights and interests of social security and public employment services. It has the basic functions of information recording, information inquiry and business handling.