Multi-stage screening device for traditional Chinese medicine decoction pieces

The utility model discloses a multistage screening device for traditional Chinese medicine decoction pieces. Comprising a screening box, a feeding hopper, a first feeding pipe arranged at the top of the screening box, a first screening combination arranged at the bottom of the first feeding pipe, a second feeding pipe arranged at the bottom of the first screening combination, a second screening combination, an air suction box, an air suction pump and a discharging pipe arranged in the air suction box. A first discharging mechanism is arranged in the first feeding pipe; a second discharging mechanism is arranged in the second feeding pipe; the first discharging mechanism comprises a mounting frame, a rotating motor, a rotating disc, a rotating rod and a brush row; through cooperation of a first screening combination, an air suction box and an air suction pump, negative pressure material suction is formed in the first screening combination, so that the screening efficiency is conveniently improved, dust can be