The invention provides a production method of 1,1,1,3,3-pentachloropropane (HCC-240fa). The 1,1,1,3,3-pentachloropropane is synthesized by continuously reacting the materials of carbon tetrachloride and chloroethylene in a tubular reactor. The method comprises the steps of firstly mixing the carbon tetrachloride with the chloroethylene and preheating the mixture to a reaction temperature, then introducing the mixture together with a catalyst into the tubular reactor for telomeric reaction, removing the unreacted carbon tetrachloride and chloroethylene through flash evaporation, and then further distilling to obtain the HCC-240fa, wherein the unreacted carbon tetrachloride and chloroethylene are recycled and the catalyst is recycled after being subjected to the activating treatment. The invention adopts the liquid as the activated system and uses the tubular reactor for reaction, thereby ensuring simple and convenient operation as well as continuous production.