The packing scale is specially designed for the packing of feed, fertilizer, powder and PE powder non flowing powder materials. The spiral feeder is used to send the materials into the buffer silo through the pneumatic valve, and the materials are sent into the bag through the variable frequency speed regulating feeding screw. The feeding quantity is controlled by controlling the screw speed. Once the bagging is completed, the opening of the bag is controlled by the control system, so that the bag can be separated from the conveyor belt and sealed manually.