The invention provides a trichloroethylene gas phase catalysis production method. Acetylene and chlorine are dried to be respectively sent to an acetylene chlorination tower, are subjected to chlorination reaction, then are gasified through a tetrachloroethane tower and a refined tetrachloroethane vaporizer, react through a splitting reactor, and are led in a desorber and a low boiling tower to reach a trichloroethylene tower to form trichloroethylene products, and matters produced after trichloroethylene is separated are processed through an inter-chamber tower to be led in another tetrachloroethylene tower to form tetrachloroethylene products. Mother liquor produced after the tetrachloroethylene is separated returns the back part of the tetrachloroethane tower to continuously participate in the reaction, materials passing through the desorber pass through an adsorption tower to adsorb hydrogen chloride, and residual materials are delivered to a soda plant for producing polyvinyl chloride raw materials. According to the trichloroethylene gas phase catalysis production method, the tetrachloroethylene products are obtained while trichloroethylene is produced, and by-products can be used for producing raw materials of polyvinyl chloride products. The trichloroethylene gas phase catalysis production method is applicable to application of production of the trichloroethylene products by using acetylene and chlorine.