Automatic feeding device

The utility model discloses an automatic feeding device which comprises an injection molding machine and an injection molding opening communicated with the upper end of the injection molding machine, a feeding tank is arranged above the injection molding opening, a supporting assembly is fixedly installed outside the feeding tank, and an adjusting assembly is fixedly installed at the rear end of the supporting assembly; and a feeding opening is formed in the bottom of the feeding tank. According to the automatic feeding device provided by the utility model, through the arrangement of the device, when materials in the feeding tank need to be supplemented, the height of the lifting ring can be increased through the first air cylinder, so that the feeding tank is far away from an injection molding opening, and then the vertical sliding rod is rotated through the second motor, so that the feeding tank is rotated to the side surface; and then the feeding tank is dropped to a proper height through the first air cyl