The invention discloses a powder bag unloading device and relates to material unloading equipment. The powder bag unloading device comprises an unloading bin and a bag opening mechanism; upper blocking strips are distributed on the top of the unloading bin at intervals; the bottom of the unloading bin is provided with an unloading door which comprises an opening and closing framework, an opening and closing plate and an opening and closing driving motor installed on one side of the opening and closing framework; a driving gear is installed on an output shaft of the opening and closing drivingmotor; the opening and closing framework is provided with a rack; the driving gear and the rack are in engaging transmission; a plurality of driven gears are installed on one side of the opening and closing framework; the rack and the driven gears are in engaging transmission; the driven gears are fixedly connected with the opening and closing plate; and the bag opening mechanism comprises a cutter clamping hinge base installed on the upper blocking strips and a cutter assembly arranged on the cutter clamping hinge base. The powder bag unloading device can achieve automatic bag opening and unloading of powder bags, and can be used for effectively improving the production efficiency and lowering cost.