The utility model relates to the technical field of tool boxes, in particular to a tool box used for low-voltage electric operation. The tool box comprises a box main body, a box door, an upper insulation layer, a lower insulation layer and a plurality of separating cross plates, wherein the box main body is divided into a plurality of areas through the separating cross plates for storing objects in various categories respectively, so that the various objects can be stored in category and convenient to manage in the low-voltage electric operation, and can be conveniently taken out when in use, the working efficiency is greatly improved, and the objects are prevented from being disorderly stored; the box door is arranged on the side surface of the box main body, and the upper insulation layer and the lower insulation layer are arranged on the upper surface and on the lower surface of the box main body respectively, so that operators can work by treading or sitting on the tool box to meet the security requirements of the electric operation and have the buffering and protective effect on the box body, a special insulation stool can be avoided, and the problems of inconvenient operation, space occupation and inconvenient carrying existing when the conventional insulation stool is in use are avoided.