The invention discloses a tool for shearing off fire wires and branches, which comprises a rod body which is flat at the upper part, a blade, and an elastic device, wherein the blade is rotationally arranged on the rod body; the front end of the blade is matched with the upper part of the rod body to form shears; the elastic device is arranged between the rear part of the blade and the rod body and is used for enabling the blade to return; the tail end of the blade is provided with an insulating rope for driving the blade to shear; the lower end of the rod body is provided with a joint connected with an insulating tension pole. The tool has the advantages that the structure is simple; one person can pull the insulting rope to shear off the branches or the waste fire wires; safety of an operator can be well protected; the tool is time-saving and labor-saving and has high efficiency.