The invention provides a method for improving the recovery rate of a heteropolyacid catalyst for hydrogen peroxide method epoxy chloropropane. A tiny amount of a P-containing assistant into a reactionsolution, a stirring heat-insulation reaction is performed at a certain temperature, the hydrogen peroxide content of a water layer obtained after the reaction is finished is lower than 0.05%, and the recovery rate of the catalyst obtained by separation is higher than 99%. The P-containing assistant is one or more of hypophosphorous acid, sodium (or potassium, calcium and the like) hypophosphite,phosphorous acid, sodium (or potassium, calcium and the like) phosphite, sodium (or potassium, calcium and the like) pyrophosphate and the like. The purpose of separating the dissolved catalyst is achieved by destroying residual hydrogen peroxide in the system and supplementing a P source to maintain the catalyst structure, so the catalyst recovery rate is increased.