The invention belongs to the technical field of chemical equipment, and particularly relates to a liquid chlorine vaporizer. The liquid chlorine vaporizer comprises a box body, a water inlet, a wateroutlet, a chlorine liquid inlet, a chlorine gas outlet and a vaporization pipeline, wherein the water inlet and the chlorine liquid inlet are arranged at the lower end of the box body; the water outlet and the chlorine gas outlet are arranged at the upper end of the box body; the vaporization pipeline is arranged inside the box body; an anti-corrosion pipeline is arranged outside the vaporizationpipeline; a pipe joint is arranged on the outer wall of the anti-corrosion pipeline; an isolation layer capable of freely sliding is arranged in an interlayer between the inner wall of the anti-corrosion pipeline and the outer wall of the vaporization pipeline; the section of the isolation layer is composed of a V-shaped folded plate unit; the V-shaped folded plate unit can freely expand in the horizontal direction. The liquid chlorine vaporizer can collect and isolate chlorine gas at leakage points of the vaporization pipeline and the plug the leakage points, and meanwhile, the isolation layer can apply a certain pressure to the outer wall of the vaporization pipeline to enhance the strength of the vaporization pipeline, so that the corrosion problem of the liquid chlorine vaporizer is solved.