The utility model discloses an automatic feeding device which comprises a base and a material lifting mechanism arranged on the base. Wherein the forward vibration disc mechanism and the backward vibration disc mechanism are arranged on the base side by side, and the material lifting mechanism is used for conveying materials to the forward vibration disc mechanism; the reciprocating vibration discmechanism and the returning vibration disc mechanism are matched to form an annular feeding channel used for reciprocating vibration feeding. Materials move along the annular feeding channel and arestably transited to the return vibration disc mechanism from the forward vibration disc mechanism at the end away from the material lifting mechanism. The end, close to the material lifting mechanism,of the annular feeding channel is provided with a height difference used for enabling materials to be overturned to the forward vibration disc mechanism from the backward vibration disc mechanism. Materials do not need to be turned over manually to adjust the state, the automation degree is high, the cost is reduced, and the production efficiency is improved; and the efficient stability of the material conveying process can be achieved.