The invention discloses an automatic reversing valve for a garbage compression station. The automatic reversing valve comprises a valve body internally provided with an oil port P, an oil port A, an oil port B and an oil port T. End covers are arranged at the left end and the right end of the valve body. A main valve element is in sliding connection into the valve body, and an installing hole is formed in the main valve element and is internally in sliding connection with a piloted valve element. The side face of the main valve element is sequentially provided with a first circular bead, a second circular bead and a third circular bead from left to right in the axial direction of the main valve element. A first master control cavity is formed between the first circular bead and the corresponding end cover, and a second master control cavity is formed between the third circular bead and the corresponding end cover. A first piloted cavity is formed between the left end of the main valveelement and the corresponding end cover, and a second piloted cavity is formed between the right end of the main valve element and the corresponding end cover. The end covers are further provided withan overflow valve device for controlling the action of the piloted valve element, and a push rod device for controlling the initial position of the piloted valve element. The valve is simple in structure, and electric control is not needed.