A method for refining 1,3-propane sultone is characterized by comprising the following steps: firstly circularly infusing refrigerating fluid with temperature of 0-30 DEG C into a crystallizer; then circularly infusing the raw material of 1,3-Propane sultone with the temperature of 32-40 DEG C into the crystallizer for forming a film-shaped crystal in a crystallizing tube; along with the continuously cooling, the film-shaped crystal of 1,3-Propane sultone is gradually thickened, when the crystal layer obtains a preset thickness, discharging the mother solution, increasing the temperature of coolant to 35-50 DEG C for melting the crystal layer; and when the crystal layer is totally dissolved, collecting the refined 1,3-Propane sultone.