The utility model discloses a slurry cooling defoaming device. The slurry cooling defoaming device comprises a compressed air pipeline, wherein the compressed air pipeline is arranged above gypsum slurry, connected with a compressor through a hose, and used for providing compressed air blowing over the gypsum slurry; vent holes are formed in the bottom of the compressed air pipeline. The slurry cooling defoaming device can be applied to the technical field of gypsum board production; by adopting the slurry cooling defoaming device, the problems existing in the prior art are effectively solved, the temperature of the slurry can be effectively reduced, and bubbles generated on the surface of the slurry can be effectively eliminated.