The utility model discloses an automatic feeding device, including conveying subassembly and the feeding subassembly of setting at conveying subassembly right -hand member, the conveying subassembly includes the conveyer belt, sets up motor no. 1 and the container of setting in the conveyer belt outside at the conveyer belt tip, the feeding subassembly includes the shell, set up in the broach portion of shell lower part, set up at the commentaries on classics board in broach portion the place ahead and set up at the collection bag part who changes the board top. The utility model discloses can tear the bag open, unload and collect the wrapping bag bagged materials, can prevent effectively that the dust from leaking, work efficiency be high.