The utility model provides a methyl chloride reaction vessel comprising a vessel body, a skirt, a vessel cover arranged on the upper part of the vessel body, a gas distributor and a thermowell which are arranged inside the vessel body, a heat change device arranged outside the vessel body, and a gas inlet, a synthesis gas outlet, a catalyst inlet, a refluence port, a liquid discharge port, a temperature measuring port, an observing port and an emptying port which are all arranged on the vessel body and the vessel cover. The novel methyl chloride reaction vessel is of evenly distributed stuff and gas, full contact with the catalyst, high efficiency of heat transport, convenient installation and repair, and is special for the synthesis of methyl chloride gas.