The invention discloses an application of a glass fiber composite to an intermediate fluid vaporizer. The application environment and structure of an LNG (liquefied natural gas) vaporizer are structurally taken into full consideration, the glass fiber composite is applied to the intermediate fluid vaporizer, namely, a first extended section and a second extended section are totally replaced with special glass fiber composite while a seawater outlet section is made with carbon steel serving as a base material, and the inner surface of the vaporizer is made with the special glass fiber composite. With the development of science and technology, the novel glass fiber composite replaces the carbon steel contacting seawater in an IFV (intermediate fluid vaporizer), corrosion is prevented, and the service life of equipment is prolonged with the overall weight of the equipment reduced. The glass fiber composite can be applied to the intermediate fluid vaporizer for large- and medium-sized LNG receiving stations under a working condition with the seawater acting as a heat source for heat exchange.