The invention discloses a cold-proof sunscreen safety cap for circuit construction maintenance. The cold-proof sunscreen safety cap comprises a cap body and a cap edge, the lower edge of the cap body is hinged to six to eight shields, the shields are connected through elastic bands, the upper end surfaces of the shields are provided with upper reflection strips, the lower end surfaces of the shields are provided with cold-proof cotton, and the cold-proof cotton are provided with lower reflection strips. According to the invention, the lower edge of the safety cap body is hinged to the shields, the shields and the cap body employ a foldable structure, and the shields can be folded upwards when not being used, can be placed in horizontal arrangement for shielding sunshine and can be folded downwards for keeping warm, resisting cold and resisting wind. Since the multiple shields are connected by use of the elastic bands, the shields can be conveniently folded. The two surfaces of each shield are provided with the reflection strips for the purpose of construction safety.