The invention relates to an accessory equipment of a fully automatic hydraulic molding unit, in particular to an automatic feeding machine which consists of a feeding vehicle and a positioner. The feeding vehicle is reciprocatedly moved by the transmission of the by power source (a motor) through a gear and a rack. The invention is characterized in that a plurality of swing claws are arranged on a vehicle frame through a pin; when the feeding vehicle moves forward, the swing claws push the corresponding number of hackbarrows to move forward; the positioner positions the hackbarrow by using a cylinder to push a supporting arm; when the feeding vehicle move backward, owing to avoid of the swing claw, any hackbarrow is not driven, thereby realizing advance of a plurality of hackbarrows and restricting to accurate positions. Owing to the technical characteristics above, the invention improves the automation degree for producing the full automatic hydraulic molding unit and reduces the labor intensity.