The invention discloses a plastic pipe fusion splicer. The structure of the plastic pipe fusion splicer comprises supporting plates, a heating cylinder, a fuel gas spray gun, a temperature sensor, a temperature display, heat insulation pipes, a die head, cross rods, a radiator and buckle plates, wherein each of the supporting plates is a cuboid panel with a length of 40 cm, the section of each supporting plate is rectangular, and the peripheral surfaces of each supporting plate are square; and the heating cylinder is composed of a heat preservation layer, a heat steel pipe, a transition box, a heat pipeline and a battery box. The plastic pipe fusion splicer is provided with the heating cylinder, and electric power is supplied to the heat steel pipe through the battery box, so that the heat steel pipe emits heat, thus welding work of the plastic pipe fusion splicer can be carried out smoothly without power supply facilities in the field environment, use range of the fusion splicer is expanded, and convenience is brought to welding work.