The utility model relates to a waste heat utilization system and particularly relates to the waste heat utilization system for methyl chlorosilane synthesis. The waste heat utilization system comprises a reactor, a reactor oil sink, a waste heat boiler and an oil cooler, wherein the reactor is in direct connection with the reactor oil sink, and the reactor oil sink is connected with the waste heat boiler by a reactor oil pump; the waste heat boiler is in direct connection with the oil cooler; the reactor oil sink is in direct connection with a heat transfer oil station through an oil inlet pipeline and an oil return pipeline; the oil return pipelines of the oil cooler and the waste heat boiler are connected with the reactor; and the reactor oil sink is connected with heat consumers through the oil inlet pipeline and the oil return pipeline. Compared with the prior art, the waste heat utilization system for the methyl chlorosilane synthesis has the advantages that the heat of the heat consumers is directly provided by high-temperature heat transfer oil of a synthesis reactor, the utilization rate of reaction waste heat of the synthesis reactor is improved, the consumption of circulating water of the oil cooler is reduced, the operation of the heat transfer oil station is closed, the heat loss and the energy source consumption are reduced, and the energy consumption of products is reduced.