A safe operation device fixed on a pipe rack is applied to a safety belt tied and hung during aloft work. A screw hole is formed in the lower end of a U-shaped pipe clamp; a bolt is arranged in the screw hole and is used for clamping the U-shaped pipe clamp on the pipe rack; and the U-shaped pipe clamp is fixed on the pipe rack by using the bolt. An upright pole is vertically welded in the upper end face of the U-shaped pipe clamp; and a steel wire rope perforation is formed in the upper end of the upright pole. The safe operation device has the benefit that the safety belts on persons carrying out aloft work on the pipe rack can be tied and hung in more places and can be hung in the high position and used in the lower position. In addition, the persons can conveniently move during work period without frequently adjusting tie-hang points.