The utility model discloses a slag discharging device, the on -line screen storage device comprises a base, the last fixed surface of base is connected with the shell, the inside of shell is equippedwith the ring channel, the inboard rotation of ring channel is connected with the arc piece, support fixedly connected with cylinder is passed through on the surface of arc piece, the fixed linkage gear that has cup jointed of outside intermediate position of cylinder, the last fixed surface of base is connected with the motor, the pivot other end welding of motor has drive gear, drive gear's surface meshing connects the surface of linkage gear, the inside of cylinder is equipped with the inner chamber. This slag discharging device can be effectual cools off the warm sludge, through the rotation of cylinder for the warm sludge can be continuous turn, through the spiral pay -off of auger, make the warm sludge to be carried at the in -process of upset, cold water in the inner chamber of deuterogamying cooling effect, thereby carry out effectual cooling to the warm sludge and handle.