The utility model provides a novel metal water knockout drum, be provided with the water knockout drum and divide the water swivel, the water knockout drum downside is equipped with the branch water swivel, be equipped with control unit on the branch water swivel, control unit is rotation type control unit, be equipped with the parts of screwing on the branch water swivel, screw the parts suit on minute water swivel, the top of dividing the water swivel is equipped with the water receiving mouth, the inside braking adjustment Assembly that is equipped with of water knockout drum, braking adjustment Assembly passes through adjusting valve control, adjusting valve is located the top of water knockout drum, the last manually rotate the wheel that is equipped with of adjusting valve, the manually rotate the wheel is ring form or six prismatic forms. Be equipped with braking adjustment Assembly in the water knockout drum, can play the control to minute water swivel, prevent to appear on the branch water swivel damaged, can in time not cut off the material that needs to carry, be equipped with adjusting valve in addition on the water knockout drum, through adjusting valve's control, can let the control of applying the brake adjustment Assembly more accurate.