The invention belongs to the field of polymer chemical engineering. The invention relates to an unsaturated polyester resin for electrical apparatus product moulding material, which is prepared from the raw materials of propylene glycol, diethylene glycol, ethylene glycol, phthalic anhydride and maleic anhydride which carry out condensation reaction to an end point, and the product is dissolved in styrene. The invention has the advantages that firstly, commonly used dihydric alcohol is adopted to synthesize the unsaturated polyester resin, so that the resin has good water resistance and flexibility, and the product has favorable mechanical properties; secondly, the resin is used together with a proper low-profile agent, especially when preparing a white product, the produced product can reach zero contraction, so that the size accuracy of the product is ensured; thirdly, the phthalic anhydride is adopted to reduce the reaction time and decrease the energy consumption; and fourthly, the ratio of unsaturated acid to saturated acid is high, so that the resin has ultrahigh activity, and the produced product has good luster.