The utility model discloses a device for improving high temperature big gun hole cooling effect, connect including tube -shape shower nozzle, spherical shower nozzle and two water injections, the one end of tube -shape shower nozzle is the open end, and the other end is sealed end, and evenly open the side of this tube -shape shower nozzle has a plurality of pores, the diameter of sphere shower nozzle is greater than the external diameter of tube -shape shower nozzle, and even the opening in surface of this sphere shower nozzle has a plurality of pores, just has the open end sealing connection of an opening, this opening and tube -shape shower nozzle, the inside of spherical shower nozzle is equipped with an atomizer, and the atomizer is connected to form by long cylindrical section and toper section, toper section and spherical shower nozzle sealing connection, and division have close hole on the contact surface of toper section and spherical shower nozzle, long cylindrical section's opening shape is the dish, two water injections connect the symmetry and set up at the tube -shape shower nozzle near close end capped both sides to towards sealed proper to the slope, the contained angle between two water injections connect is the acute angle. The utility model discloses the device can be realized full hole, last the cooling, improves the cooling effect by a relatively large margin.