The invention discloses a preparation method of a copolymer of sulfur dioxide and epoxy compounds; a novel polysulfone material is prepared by using SalenMX to catalyze the copolymerization of sulfur dioxide and epoxy compounds, adding epoxy compounds and SalenMX into a high-pressure reactor in sequence, and then injecting sulfur dioxide into the React at 50~100°C, react for 8~48 hours to obtain the product, namely sulfur dioxide and epoxy compound copolymer, dissolve the product in chloroform and precipitate with hydrochloric acid methanol mixture, filter the amber precipitate and wash it repeatedly with methanol for 2~4 times , the washed product is moved to a vacuum drying oven for 8 to 24 hours at room temperature and vacuum-dried to obtain a copolymer of sulfur dioxide and epoxy compounds with higher tacticity; the preparation method involved in the present invention is simple, the catalyst consumption is small, and the reaction The temperature is mild, the yield is high, the structure of the product is good, the cost is low, and industrial production is easy to realize.