A method for producing 4-propyl-[1,3,2]dioxathiolane-2,2-dioxide comprises an addition reaction, an oxidation reaction and a purifying process. The method concretely comprises the following steps: 1, carrying out the addition reaction: carrying out addition reaction on thionyl chloride and 1,2-pentanediol as reaction raw materials; 2, carrying out the oxidation reaction: adding a sodium hypochlorite and catalyst mixed solution, carrying out the oxidation reaction to obtain a water phase and organic phase co-existence reaction solution, standing the water phase and organic phase co-existence reaction solution for layering, and separating the obtained water phase to obtain the organic phase which is crude 4-propyl-[1,3,2]dioxathiolane-2,2-dioxide; and 3, purifying: carrying out molecular distillation to obtain 4-propyl-[1,3,2]dioxathiolane-2,2-dioxide. The purity of the prepared 4-propyl-[1,3,2]dioxathiolane-2,2-dioxide can be greater than 99.5%, the water content is not greater than 100PPM, the acid value is not greater than 100PPM, and 4-propyl-[1,3,2]dioxathiolane-2,2-dioxide can be added to a battery in order to improve the performances of the battery and prolong the life of the battery.