Novel powder feeder

The utility model discloses a novel powder feeder which comprises an installation seat and a cylindrical stock bin, a through hole is formed in the bottom of the stock bin, and the through hole is connected with an air blower through a discharging pipe. A circular-truncated-cone-shaped protrusion concentric with the stock bin is arranged at the bottom of the cylindrical stock bin, the diameter of the bottom face of the circular-truncated-cone-shaped protrusion is smaller than that of the bottom face of the stock bin, and a through hole is formed in an annular plane between the circular-truncated-cone-shaped protrusion and the side wall of the stock bin. A motor is installed in the center of the circular-truncated-cone-shaped protrusion and provided with a shifting rod attached to the bottom face of the stock bin in shape. The annular groove with the inverted trapezoidal section is formed by the cylindrical stock bin and the circular-truncated-cone-shaped protrusion, powder falls down from the through hole in