The invention relates to an improved punching machine tool, comprising a frame, a pedal, a runner, a pulley, a cam, a punching rod, an infrared sensing device, a brake and a return device. The pedalsand wheels are rotatably arranged on the machine frame, A crank is formed by extending the middle part of the pulley outwardly, the crank and the pedal are connected through a connecting rod, the pulley is rotatably installed on the machine frame, and is connected with the pulley through a belt, a rotating shaft is fixed in the middle part of the pulley, a cam is installed on the rotating shaft, an adjusting lever is hinged on the cam, and a punching lever is hinged on the side of the adjusting lever away from the cam. The infrared sensing device is arranged on the workbench under the punchingrod of the machine frame, and is electrically connected with the brake, the brake sleeve is arranged on the outer periphery of the connecting rod, and the return device is installed directly under the pedal. The invention has high safety performance, effectively eliminates the occurrence of safety accidents, ensures the personal safety of operators, and has high stamping efficiency.