The invention provides a method for raising dispersibility of insoluble sulphur, comprising the following steps of: adding a high-molecular material coating agent into an insoluble sulphur powder to clad an IS powder, wherein the high-molecular material is added into the IS powder through dissolution of a solvent; then reducing pressure and drying under vacuum to remove the solvent, wherein the high-molecular material coating agent comprises natural and modified high-molecular substances such as amylase, amylopectin, modified starch, cyclodextrin, gelatin, guar gum, xanthium gel, pectin, Arabic gum, xanthan gum, Locust bean gum and the like; the addition amount of the high-molecular material coating agent is 0.1-5%; the solvent is water; the pressure of vacuum drying is less than or equal to 12 Kpa; and the material temperature is less than or equal to 50 DEG C. the method has advantages of simple operation, low cost, high efficiency and no environmental pollution, and is suitable for industrial production.