The invention discloses a production method of gamma-chloropropyl trichlorosilane, belonging to the technical field of silicon chemical industry. The production method is characterized by comprising the following preparation steps: proportioning trichlorosilane and chloropropene, and then injecting into a measuring tank for standby application; adding a chloroplatinic acid catalyst, a side reaction inhibitor and silicon tetrachloride into a reaction still; adding the whole chloropropene into the reaction still, and then starting to dropwise add the trichlorosilane, wherein when the temperature of the reaction still is gradually increased to 57 DEG C along with the process of a reaction, silicon tetrachloride starts to get condensate and flows back, and the whole trichlorosilane is dropwise added within 4h-9h; after the whole trichlorosilane is dropwise added, increasing the temperature to 80-90 DEG C, keeping the temperature for 1-2.5h, and separating a product to obtain the gamma-chloropropyl trichlorosilane. According to the production method, the reaction can be performed at a low temperature or normal temperature, an induction period is not needed, the reaction time is short, and the catalyst is not easy to inactivate and is small in use amount.