The utility model relates to a curtain wall fireproof device, comprising a wall body, a heat-preservation layer tightly attached to the wall body, and a curtain wall mounted on the surface of the wall body, wherein a plurality of closed chambers are formed between the curtain wall and the heat-preservation layer; a main gas conveying pipeline is pre-embedded in the wall body, is filled with inflaming retarding gas and is communicated with a gas conveying branch pipe and extends to the outer side of the wall body; the gas conveying branch pipe is communicated with a coiled pipe which is arranged along the outer side of the wall body; and holes are distributed on the surface of the coiled pipe and are sealed by soluble glue. The curtain wall fireproof device has a simple structure, saves a large quantity of circuit structures and can rapidly and effectively stop spreading fire.