The utility model discloses an automatic screen discharging device of a multi-station sand wheel forming machine. The automatic screen discharging device comprises a frame; a linear guide rod is horizontally arranged on the frame; a screen sheet separation board is slidably arranged on the linear guide rod; a screen sheet separation film cavity is arranged on the board surface at one side of the screen sheet separation board; a positioning loop is arranged above the board surface at the other side of the screen sheet separation board; a screen sheet stacking cylinder is sleeved inside the positioning loop; a lower cylinder opening of the screen sheet stacking cylinder and the screen sheet separation board are in sliding contact; a screen sheet picking mechanism is arranged above the screen sheet separation film cavity on the frame; the screen sheet picking mechanism consists of a lifting air cylinder, a shaft sleeve fixedly arranged at the lower end part of a piston rod of the lifting air cylinder, and an elastic stretching picking head arranged inside the shaft sleeve; a rack is vertically and fixedly connected on the piston rod of the lifting air cylinder; and the rack is engaged with a gear of a rotary encoder. The automatic screen discharging device provided by the utility model has the advantages of high automation degree and high working efficiency; the influence on the product quality caused by human factors can be avoided; and the phenomena of missing and additionally arranging a screen sheet can be prevented from occurring.