Water pump impeller

The invention discloses a water pump impeller which comprises a vane inlet angle (7) Beta 1 and a vane outlet angle (8) Beta 2; the range of Beta 1 is 10 degrees to 20 degrees; the Beta 2 is 25 degrees to 45 degrees. When the technical proposal is adopted, each vane adopts the most reasonable vane inlet angle and the vane outlet angle to improve the pump water efficiency of the cooling water and the cooling effect on the engine; a front retaining plate and a back retaining plate are arranged on the impeller to enable the impeller to be fully-closed type, so as to reduce the mounting gap between the water pump and the turbine shell; the proper number of vanes is adopted to further improve the work efficiency of the water pump; the impeller is made of engineering plastic for reducing the weight of the water pump.