The utility model discloses a novel power box who has dampproofing sun -proof function, the power distribution box comprises a box body, the equal fixedly connected with bracing piece of box upper endfour corners department, the upper end fixedly connected with sunscreen cover of bracing piece, fixedly connected with mounting panel between the bracing piece, fixed surface is connected with driving motor on the mounting panel, the upper end of box is equipped with the opening, fixedly connected with drum in the opening, be equipped with the sliding block in the drum, the upper end of sliding block is rotated and is connected with first dwang, the one end rotation that the sliding block was kept away from to first dwang is connected with the second dwang, first dwang was kept away from to the second dwang one end run through the mounting panel and with driving motor's drive shaft fixed connection, and be equipped with the bar opening corresponding with the second dwang on the mounting panel, the upper end fixedly connected with drying box of box, drying box's upper end is rotated and is connected with the lid. The utility model discloses have dampproofing sun -proof function, make electrical components be difficult for rustting and age, prolonged its life.