The invention discloses a technology and a device used for synthesis of methyl chloride from hydrogen chloride obtained through hydrolysis of methylchlorosilane. The technology comprises following steps: methylchlorosilane hydrolysis is carried out so as to obtain pressurized hydrogen chloride gas, the pressurized hydrogen chloride gas is subjected to hydrogen chloride saturated hydrogen chloride-methanol solution washing and active carbon fiber adsorption combined processing to remove silicon containing compounds in the pressurized hydrogen chloride gas; the purified hydrogen chloride gas andpreheated methanol liquid are introduced into a methyl chloride synthesis kettle using a graphite injector for synthesis of methyl chloride; an obtained synthesis product is introduced into a coolerthrough a demister, an obtained cooled gas liquid mixture is introduced into a methyl chloride water washing system. The technology and device are capable of reducing unfavorable influences of impurities in hydrogen chloride obtained through methylchlorosilane hydrolysis on methyl chloride synthesis, realizing full utilization of synthesis reaction heat, simplifying technology, increasing methyl chloride synthesis kettle space time yield and methyl chloride yield, reducing waste acid amount, saving energy and reducing consumption, and achieving obvious economic benefits and environment protection benefits.