The utility model discloses a pneumatic sediment gate valve of arranging of bearing, including the valve body the side valve is installed to one side of valve body install the disk seat in the side valve install the flashboard in the valve body, just the flashboard passes through screw and floodgate body coupling the valve gap is installed at the top of valve body, the constant head tank has been seted up at the top of valve body, the bottom surface of valve gap have with constant head tank complex round pin axle, the valve gap passes through double -screw bolt fit nut fixed mounting in the top of valve body at both ends the top of valve gap is equipped with open structure, the open structure intussuseption is filled with the filler the clamp plate is installed at the top of packing a supporting bench is installed at the top of clamp plate, the lower extreme that props up supporting bench passes through the support column to be connected with the clamp plate prop up supporting bench's top and install the backup pad, install pneumatic means in the backup pad, pneumatic means's push rod is connected with the one end of valve rod, the other end and the flashboard that is located the valve body of valve rod are connected.