The invention relates to a double-supported submersible water impeller comprising a submersible water impeller main body, a lifting device and two supporting sliding rails, wherein the lifting device is fixed on the surface of a pool through a pool surface mounting foundation; the two supporting sliding rails are vertically fixed at the bottom of the pool through a pool bottom mounting foundation; the top ends of the two supporting sliding rails are pulled and connected to the pool surface mounting foundation through connecting rods; mounting seats are penetrated and fixed on the two supporting sliding rails and are provided with two brackets back and forth along the direction vertical to the direction of the supporting sliding rails; and the submersible water impeller main body is hung and connected to the lifting device through a steel wire rope and is in a state of being respectively supported on the two brackets after lifting along the vertical direction of the supporting sliding rails or falling to the front and rear ends of the axial direction of the submersible water impeller main body. By using the double-supported submersible water impeller, the technical problems of high underwater vibration, high noise and short service life of an impeller are thoroughly solved; and the double-supported submersible water impeller is stable in working, reliable in operation and simple in maintenance.