The utility model discloses a cold hydrogen case of spiral overhead paddle, it includes the discoid intercepter plate of coaxial coupling, cylindric mixing box, discoid backup pad, the center of backup pad is equipped with circular spout hole, the radius of intercepter plate is greater than the cross section radius of mixing box, be equipped with two at least orifices along disk border on the intercepter plate, the orifice is connected with the top of gas -liquid downtake, the bottom of gas -liquid downtake is followed the vertical direction tangential with the outer wall of tangential honeycomb duct and is connected, horizontal direction tangential intercommunication is followed with the lateral wall of mixing box in the bottom of tangential honeycomb duct, be equipped with two sets of opposite spiral baffles of mixing box axis direction of rotation that center on in the inner chamber of mixing box, the upper surface in the backup pad is fixed to the bottom of spiral baffle. The circulation passageway of two relatively independent spiral helicine gas -liquid mixture things is cut apart into with the inner chamber of mixing box to the spiral baffle, has prolonged the dwell time of mixture, lose one's temper with each other that the liquid phase fully contacts, has reduced the height of mixing box, has reduced the volume of equipment.