The invention discloses an experiment bench of a machinery safety protection control system. The experiment bench comprises a workpiece moving system, a safety protection control system and a work bench. The workpiece moving system comprises a driving motor, limiting sensors, a workpiece, a synchronous belt, a sliding bench and a robot control box. The synchronous belt is installed on the work bench and drives the workpiece to linearly move. The driving motor is installed on one end of the synchronous belt. The sliding bench is installed on the upper end of the synchronous belt. The workpiece is arranged on the sliding bench. The limiting sensors are installed on two ends of the synchronous belt. A safe input device comprises a safe light screen which is installed between conveyor belts. The detection direction of the safe light screen is perpendicular to the moving direction of the conveyor belts. The safe output device comprises multiple layers of warning lights which are connected with a safe relay. The safe control device comprises a safe controller, the safe relay and a computer. The safe controller is connected with the computer. The experiment bench is highly exchangeable.