The invention discloses an automatic brick truck loader. The automatic brick truck loader comprises a brick distribution platform; and the brick distribution platform is divided into an area A, an area B, an area C and an area D. The automatic brick truck loader further comprises a bracket for covering the whole area of the brick distribution platform; overhead crane guide rails are arranged on brackets at the tops of the area A and the area D, and are provided with grabbing disc lifting systems; the grabbing disc lifting systems are connected with brick grabbing discs; a transverse pushing system is arranged in the area B near the boundary of the area A, and includes a transverse push rod, a transverse push rod driving gear box for supplying power to the transverse push rod and a transverse push rod guide rail; longitudinal pushing systems are arranged on one sides of the area B and the area C; and longitudinal fixed push plates and longitudinal movable push plates are arranged on longitudinal push rods. The invention further discloses a truck loading method of the automatic brick truck loader. The automatic brick truck loader is simple in structure, suitable for various carriage sizes of brick loading trucks and wide in application range, largely saves labors, and accelerates the truck loading speed.