An electrically driven pump, comprising a rotor assembly, a stator assembly, and a partition, wherein the rotor assembly and the stator assembly are partitioned by the partition, the rotor assembly comprises an impeller, the impeller comprises an upper plate, blades and a lower plate, an inlet of the impeller is formed by the upper plate, the blades are provided between the upper plate and the lower plate, and the upper plate comprises an upper surface and a lower surface, wherein, the blades and the upper plate are integrally formed by injection molding, the blades are located on the lower surface of the upper plate, the blades comprise first blades and second blades, and each of the first blades and the second blades comprises a camber, or a combination of two or more than two cambers, or a combination of a camber and a plane; a length of each of the first blades is greater than a length of each of the second blades, the first blades are uniformly distributed along a circumference of the upper plate, and the second blades are uniformly distributed along the circumference of the upper plate; a number of the first blades is the same as a number of the second blades, and the first blades and the second blades are distributed alternately along the circumferential direction of the upper plate; each of the first blades comprises a first head portion and a first tail portion, each of the second blades comprises a second head portion and a second tail portion, an outer edge of the upper plate defines a first circumference with a diameter of Φ1, the second head portions of the second blades are located at a second circumference with a diameter of Φ2, and the diameter Φ2 of the second circumference ranges from 60 percent to 75 percent of the diameter Φ1 of the first circumference; and the first head portion of each of the first blades is fixed to the upper plate by injection molding, characterized in that each of the first tail portion and the second tail portion is aligned with the outer edge of the upper plate, and when a straight line passing through a fixing point, where the first head portion is fixed to the upper plate, and being in parallel with a central axis of the first circumference is defined, an included angle between the first head portion and the straight line is defined as a front inclination angle (θ3) of each of the first blades, the front inclination angle is referred to as a certain acute angle formed by the first head portion rotating from the central axis in a counterclockwise direction, and the front inclination angle (θ3) ranges from 20 degrees to 50 degrees. the blades and the upper plate are integrally formed by injection molding, the blades are located on the lower surface of the upper plate, the blades comprise first blades and second blades, and each of the first blades and the second blades comprises a camber, or a combination of two or more than two cambers, or a combination of a camber and a plane; a length of each of the first blades is greater than a length of each of the second blades, the first blades are uniformly distributed along a circumference of the upper plate, and the second blades are uniformly distributed along the circumference of the upper plate; a number of the first blades is the same as a number of the second blades, and the first blades and the second blades are distributed alternately along the circumferential direction of the upper plate; each of the first blades comprises a first head portion and a first tail portion, each of the second blades comprises a second head portion and a second tail portion, an outer edge of the upper plate defines a first circumference with a diameter of Φ1, the second head portions of the second blades are located at a second circumference with a diameter of Φ2, and the diameter Φ2 of the second circumference ranges from 60 percent to 75 percent of the diameter Φ1 of the first circumference; and the first head portion of each of the first blades is fixed to the upper plate by injection molding, characterized in that each of the first tail portion and the second tail portion is aligned with the outer edge of the upper plate, and when a straight line passing through a fixing point, where the first head portion is fixed to the upper plate, and being in parallel with a central axis of the first circumference is defined, an included angle between the first head portion and the straight line is defined as a front inclination angle (θ3) of each of the first blades, the front inclination angle is referred to as a certain acute angle formed by the first head portion rotating from the central axis in a counterclockwise direction, and the front inclination angle (θ3) ranges from 20 degrees to 50 degrees.