The invention provides a safety restraint strap locking structure for the psychiatry department, belongs to the field of medical instruments for the psychiatry department, and solves the problem that an existing restraint strap is troublesome in fixing and has potential safety hazard. The safety restraint strap locking structure comprises a bed frame, restraint ropes and locking seats, wherein locking balls are fixed on each restraint rope, locking covers are fixed at two ends of each locking seat, each locking seat comprises an upper plate, a lower plate, a left plate and a right plate, the upper plate is fixed at the bottom of the bed frame, two locking mechanisms are arranged in each locking seat, each locking mechanism comprises an upper locking hole located in the upper plate and a lower locking hole located in the lower plate, each locking mechanism further comprises a support plate which is fixed in the corresponding locking seat and provided with a support hole, each locking mechanism further comprises a locking rod penetrating the support hole, each locking cover is provided with a cover hole, the front end of each locking rod penetrates out of the corresponding cover hole, each locking mechanism also comprises locking plates connected to the locking rod, and the two locking plates seal between the upper locking hole and the lower locking hole. The safety restraint strap locking structure is convenient in restraint strap fixing, and safety after the fixing is achieved.