Abstract: A door closing mechanism, including a single guide track mechanism provided on a door mounting block, a connecting rod mechanism and a cabinet mounting plate, wherein a spring mounting rod is fixed on the door mounting block, an angle retaining block is rotatably fixed on a panel of the door mounting block, an outer wall of the angle retaining block is slidably connected with a top end of a chute rod, and when the chute rod is moved in a guide chute, the top end of the chute rod drives the angle retaining block to rotate, and a reset spring is mounted between the angle retaining block and the spring mounting rod; in the automatic door-closing mechanism, by a coordinating action of the angle retaining block and the chute rod for guiding track changing, angle retaining and automatic door closing actions.