Rapeseed impurity removal device

The utility model provides a rapeseed impurity removal device which comprises a box body, a drainage port, a discharge port, a drainage pipe, a sliding block, a screen and a linkage assembly, rapeseeds are placed in the box body, water is added into the box body, the water rises to drive chippings and floating impurities to move upwards to overflow from the drainage port, water adding is stopped until the surface of the water in the box body is clean, and then the rapeseeds are discharged out of the box body. Through a screen of the box body, soil water mixed in the rapeseeds is melted into dust particles to be precipitated at the bottom of the screen, sewage is discharged through a drainage pipe, clean rapeseeds are reserved on the screen, one end of the screen is driven by a linkage assembly to move upwards, and the rapeseeds are cleaned; and the other end of the screen drives the sliding block to move to open the discharging opening, so that the rapeseeds slide to the discharging opening to be taken out, a