The utility model relates to the field of garbage transfer. More particularly, the present utility model relates to a battery, the utility model relates to a garbage truck with an automatic door locking mechanism. The problem that a box door of a garbage truck needs to be closed manually is solved. According to the technical scheme, the garbage truck comprises a truck body, a truck bed rotationally connected to the truck body and a truck door rotationally connected to the truck bed, a feeding port matched with the truck door is formed in the truck bed and connected with the truck door througha rotating shaft, the rotating shaft is sleeved with a torsional spring, one end of the torsional spring is fixed to the truck door, and the other end of the torsional spring is fixed to the peripheral wall of the feeding port; an electromagnet for attracting the box door is further fixed to the box, the electromagnet is located on the side, away from the feeding port, of the rotating shaft, and the box door is provided with an electromagnetic piece matched with the electromagnet. Through the design of the electromagnet and the electromagnetic sheet, the box door can be attracted and locked bythe electromagnet in the garbage dumping process; and through the design of a torsional spring, after garbage is dumped, the box door can be automatically closed.