NOVELTY - Production of tetrachloroethylene and co-production of hexachloroethane by using methane chloride residual liquid includes subjecting methane chloride residual liquid to vaporization and overheating, where excessive chlorine enters a reactor, introducing the mixed gas after reaction into a chilling tower, extracting tetrachloroethylene crude product in gas phase from the top side line of the chilling tower, and passing the gas containing carbon tetrachloride, excessive chlorine, and hydrogen chloride through three stages of condensers and a separation tank in sequence.    USE - Production of tetrachloroethylene and co-production of hexachloroethane (claimed).    ADVANTAGE - The method realizes harmless treatment of methane chloride residual liquid and avoids environmental pollution caused by improper treatment.    DETAILED DESCRIPTION - Production of tetrachloroethylene and co-production of hexachloroethane by using methane chloride residual liquid comprises subjecting methane chloride residual liquid containing trichloromethane, carbon tetrachloride, vinyl chloride, tetrachloroethylene, dichloroethane, tetrachloroethane, and chloromethane to vaporization and overheating, where excessive chlorine enters a reactor, introducing the mixed gas after reaction into a chilling tower, extracting tetrachloroethylene crude product in gas phase from the top side line of the chilling tower, passing the gas containing carbon tetrachloride, excessive chlorine, and hydrogen chloride through three stages of condensers and a separation tank in sequence, where one part of condensed liquid-phase material carbon tetrachloride is used as chilling liquid, and the other part of condensed liquid-phase material carbon tetrachloride is returned to the system for reaction, absorbing hydrogen chloride and excessive chlorine by water and subjecting to steam stripping, returning chlorine to the reaction system, treating the materials at the bottom of the chilling tower in a light component-removing column, so that the light components including tetrachloroethylene and pentachloroethane are separated and returned to the reactor for reaction, and subjecting hexachloroethane to rectification to obtain hexachloroethane finished product.