The invention provides a method for synthesizing chloromethyl isopropyl carbonate. The method comprises the following steps: 1) at 0-5 DEG C, adding a photoinitiator, performing illumination reaction to dimethyl carbonate and chlorine, stopping reaction, and performing rectification separation on a product to obtain chlorodimethyl carbonate; 2) at 70-100 DEG C, adding a catalyst, adding chlorodimethyl carbonate and isopropanol into a rectification tower of which the reflux ratio can be controlled, reacting and simultaneously performing normal pressure rectification separation to evaporate methanol, after the reaction is accomplished, performing reduced pressure distillation to remove excessive isopropanol, and finally performing reduced pressure distillation to obtain chloromethyl isopropyl carbonate. The method is low in reaction energy consumption, high in raw material recycling and utilization rate, relatively simple in aftertreatment and small in environment pollution, and meets the development of green chemistry.