The electric fusion welding machine is a device that supplies power to the electric fusion sleeve (tape), which contains embedded electric fusion mesh (wire) that up, causing the surface of the pipes and fittings to melt. After cooling and solidification, the plastic pipes are welded together. The polymeric plastic researchers have this electric fusion welding machine, which has stable input and output voltage, adjustable current and time, strong operability, small size, light weight, convenient construction, easy portability. This model of the electric fusion welding machine is set at 220V/380V voltage, with automatic identification and free. It prevents the loss caused by burning key components due to wrong voltage connection, prolongs the service life, saves the user's cost, and provides convenience in for the users.