The invention discloses a refined screening machine for metallurgical machining non-ferrous metals. The refined screening machine structurally includes a supporting frame, a driving device, a transmission device and a screen box. The supporting frame is equipped with the driving device and the transmission device, and the driving device and the transmission device are matched in the screen box ina transmission mode. The screen box is internally provided with discharge ports, a first material distribution groove, a screening plate, a second material distribution groove, a shell, a feed port, and a buffer mechanism. The feed port is internally provided with a buffer mechanism, and a screen plate is horizontally installed between the first material distribution groove and the second materialdistribution groove, the transmission end of the screen plate is electrically connected to the driving device, and the discharge ports are fixed to the first material distribution groove and the second material distribution groove correspondingly. According to the buffer mechanism, when a material is fed at the feed port, through a method that the circular high-speed turning movement formed by aturntable matched by a supporting shaft is in contact matching with a material, the turntable cuts into the material continuously, the problem of strong impact force due to the excessive concentrationon the screening plate during feeding is further solved, and a spring is arranged in the supporting shaft to cooperate with the turntable so as to buffer the turntable.