The invention relates to a method of recovery and utilization of a vented tail gas of organosilicon crude monomer synthesis, a lot of tail gas are vented by a methyl chloride column in the organosilicon monomer synthesis process, a small amount of reaction product are removed, the vented tail gas mainly comprises boosting gas nitrogen brought into the system and methyl chloride gas which cannot be condensed, the boosting gas nitrogen is an inorganic small molecule, the methyl chloride gas is an organic compound, and the boosting gas nitrogen and the methyl chloride gas can be separated by a membrane separation technique. The separated non-condensable gas can replace fresh nitrogen to be used as a boosting gas in the production; and the separated methyl chloride can be compressed by a compressor, and recovered and utilized. Under the premise of smooth venting, by low cost low difficulty process transformation, the boosting gas nitrogen consumption can be reduced, a large amount of non-condensable gas brought into the system by silica fume and catalyst feeding and back-to-bed fine powder can be reduced, the methyl chloride brought by venting of the tail gas of the methyl chloride column can be reduced, and the methyl chloride wasted by the venting of the tail gas can be recovered and utilized.