The invention discloses a mechanical arm for screening industrial parts. The mechanical arm comprises a coil, a transmission rod, a connecting column, a rotating bearing, a quality product conveyor belt and a screener. The lower end of the coil is connected with the screener, and the upper end of the coil is electrically connected with a transformer. The transformer and an angle adjusting shaft are connected through a fixing rod. The angle adjusting shaft and a rotating shaft are connected through the connecting column. A first motor is arranged in the rotating bearing and connected with a second motor. A base is arranged at the lower end of a control panel, and the quality product conveyor belt is arranged at the right end of the control panel. A hydraulic device and the angle adjusting shaft are connected through the transmission rod. A waste storage box is arranged at the lower end of the conveyor belt. According to the practical mechanical arm for screening the industrial parts, in combination with existing industrial part screening equipment, creative design is carried out. The mechanical arm for screening the industrial parts is provided with an intelligent control system, and can distinguish and screen the industrial parts faster and more precisely.