The invention discloses a DC power box, comprising a box body and a box door, wherein the box body is internally provided with a control circuit and a battery; the control circuit is connected with a low-voltage protection relay and a lightning arrester, a drainage passage is connected between the top and the bottom of the box body and is arranged in the side wall of the box body. With adoption of the DC power box, such problems of the existing DC power box, such as absence of low-voltage protection and poor heat dissipating effect, can be solved.