The invention relates to an inner heater of liquid zinc corrosion resistance alloy. The inner heater of the liquid zinc corrosion resistance alloy is characterized by comprising a compression seal device, an additional pipe, a first connecting flange, a second connecting flange, an outer sleeve, a heat conductor, an electrical heating core, a top pillar, an antioxidant and two extraction electrodes, wherein the electrical heating core is a U-shaped electrical heating pipe, and comprises a heating area and a connection electrode area, a designed number of metal plates are evenly distributed along the length direction of the heating area of the electrical heating core, a disk is welded at the top of the connection electrode area of the electrical heating core, the top of the U-shaped electrical heating pipe and the disk are welded into a whole, the two extraction electrodes are respectively extracted from two ends of the U-shaped electrical heating pipe, the two extraction electrodes are connected with a power source through lead wires, a connection blind hole is formed in the disk, the lower end of the top pillar is connected with the connection blind hole, the upper end of the top pillar is connected with a compression bolt, the additional pipe is a cylinder with two ends open, and the upper end of the additional pipe is connected with the disk.