Mortar discharging machine capable of automatically screening and grading

The invention relates to the technical field of mortar discharging machines, and discloses a mortar discharging machine capable of automatically screening and grading. The machine comprises a discharging machine body, a mounting plate is fixedly mounted at the top end of the discharging machine body, a driving motor is fixedly mounted in the middle of the top end of the mounting plate, only a feeding port is formed in the left side of the driving motor, and the feeding port is formed in the top end of the mounting plate. According to the mortar discharging machine capable of automatically screening and grading, during discharging, mortar enters a screening cavity from the feeding port and falls to the position above a first screening plate. Then, a lead screw is started to drive a screening column to do up and down reciprocated moving for screening; and in the operation process of the lead screw, mortar materials pass through the first screening plate, a second screening plate and screening holes of different