The busbar joint heat shrinkable shield is referred to as the busbar box, which is made of radiation crosslinked polyolefin material, and is an insulating material for the connection of the bus bar. The busbar box has the functions of electrical insulation, anti rust and anti-corrosion of solder joints, mechanical protection and reducing phase to phase distance, so as to ensure the safe operation of the power grid. With excellent electrical, physical and chemical properties, it can deal with the safety protection problems of the transformer. It is widely used in insulation protection and safety protection of bus bar connection and power transformer terminal in power plants and substations