The invention discloses an automatic bar pushing device. The automatic bar pushing device comprises a guide rail, brackets used for holding bars placed by a bar grabbing and conveying device, a push rod and a rotation mechanism. The push rod is arranged on the guide rail and driven by a bar push air cylinder. The rotation mechanism is assembled at the tail end of the guide rail and connected to the brackets located outside the guide rail. When the push rod is pushed to the position of the bars located on the brackets, the rotation mechanism drives the brackets to rotate downwards with the rotation mechanism as the rotation center. The automatic bar pushing device has the beneficial effects that the production efficiency and the stability of finished product quality are improved, and the problems of low efficiency and low safety coefficient caused by manual operation are solved.