Automatic seed screening pretreatment device

The utility model discloses an automatic seed screening pretreatment device which comprises a machine body, an impurity removal fan fixedly communicated with the middle of the bottom end of the machine body, an inclined plate fixedly installed in the machine body, a rotating flange fixedly installed at an air outlet of the impurity removal fan, an air conveying pipe fixedly installed at the top end of the rotating flange, and the top end of the air conveying pipe penetrates through the inclined plate. A servo motor is fixedly installed on one side of the bottom end of the machine body, the output end of the servo motor penetrates through the machine body and is fixedly provided with a driving wheel, a driven wheel is arranged at the connecting position of the air conveying pipe and the rotating flange in a sleeved mode, and the driving wheel is in transmission connection with the driven wheel through a belt. By arranging a gas conveying pipe, a spray head and an impurity removal fan, gas is conveyed to the sp