The invention discloses a terminal box. The terminal box comprises a box body, wherein a knife switch is arranged in the box body, a grounding line connector is arranged on the box body on one side of the knife switch, the knife switch comprises a bottom plate and a switch body, line combination contacts are arranged at the upper part of the bottom plate, the switch body is rotatably connected to the middle of the bottom plate, grounding contacts are arranged at the lower part of the bottom plate, a detachable conductive plate is arranged on the bottom plate and is used for connecting the grounding contacts in series, and in the box body, a grounding contact point is arranged on the side of the grounding connector and is connected with a conductive plate. The terminal box has the advantages that the grounding line connector and the grounding contact point can be conveniently connected during maintenance to achieve grounding; meanwhile, the grounding line is convenient to be hung, the conductive plate in the box body can be freely disassembled and assembled according to actual demands to be a grounding terminal box, the risk of installation and grounding on the condition that an upper pile head is on live is avoided, and the working safety is greatly improved; after the conductive plate is disassembled, the conductive plate can be used as a dual-power supply switching box; and such terminal box is installed for a user with high requirement on power utilization quality, the function of dual-power supply switching can be achieved, and the power utilization quality is greatly improved.