The utility model discloses a tool for shearing off live wires and tree branches. The tool comprises a rod, blades and an elastic device, wherein the upper portion of the rod is flat; the blades are rotatably arranged on the rod; the front ends of the blades are matched with the upper portion of the rod to form scissors; the elastic device is arranged between the rears of the blades and the rod and enables the blades to reset; insulating ropes which drive the blades to shear are arranged at tail ends of the blades; and a connector which is connected with an insulation bar is arranged at the lower end of the rod. The tool for shearing off the live wires and the tree branches has the advantages that the tool is simple in structure, when an operator pulls the insulating ropes, a tree branch or a wasted live wire can be shorn off, the safety of the operator can be well guaranteed, the time and the labor are saved, and the efficiency is high.