The invention relates to a power box. The power box comprises a box body and a box cover, and the box body and the box cover are matched in size and connected through a hinge. The power box further comprises an accessory installing plate and a waterproof assembly; the accessory installing plate is fixed to the bottom in the box body; the waterproof assembly comprises a bent edge and a rubber strip, the bent edge is arranged on an opening of the box body, and the rubber strip is arranged in the box cover and corresponds to the bent edge. The hinge comprises a first shaft sleeve, a second shaft sleeve and a hinge pin, the first shaft sleeve is fixedly connected with the box body, the second shaft sleeve is fixedly connected with the box cover, and the hinge pin penetrates through the inside of the first shaft sleeve and the inside of the second shaft sleeve. A supporting plate is additionally arranged for replacing an original box body bottom plate to fix an electric appliance in the power box, so that the seal effect and aesthetics are improved; the bent edge and the rubber strip are additionally arranged on the opening of the box body, and therefore the waterproof effect of the power box is improved; face contact connection between the hinge pin and the shaft sleeves is designed into point contact connection, so that the hinge is convenient to assemble and disassemble, and the power box is also convenient to assemble, disassemble and maintain.