The utility model relates to a radiation protective device for an emergency power supply for fire protection, which comprises a radiation plate (4) and a wind channel (13). The utility model is characterized in that a module (3) and a bridge rectifier (2) which need radiating are arranged on the radiation plate (4); the wind channel (13) is arranged under the radiation plate (4), and one end of the wind channel (13) is provided with a fan installation rack (1) hermitically connected with the wind channel (13); the fan installation rack (1) is provided with a blowing opening (14), and a fan is arranged in the blowing opening (14). The best condition is that the other end of the wind channel (13) is also provided with a fan, and a corresponding pull-type wind suction structure can be formed to obtain a better radiation effect.