The invention relates to the technical field of centrifugal pumps, in particular to a tail shaping method of a centrifugal pump blade, a centrifugal pump impeller and a centrifugal pump. The tail shaping method of the centrifugal pump blade comprises the following steps: S1, taking a point A at an original outlet side of the blade, and regarding an arc formed from the point A to a pressure side of the blade as a shaped outlet side; S2, regarding an extension line of a connecting line of the circular center of a wheel disc and the point A as the X axis, and regarding a tangent line, formed by taking the point A as a tangency point, of an outlet circle of the blade as the Y axis; S3, forming a radial, wherein the radial is formed by taking the point A as the starting point, forms an acute angle or a right angle with the Y axis in the forward direction, and extends in the negative direction of the X axis; S4, forming a first auxiliary circle by taking the circular center of the wheel disc as the circular center, wherein the diameter of the first auxiliary circle is smaller than that of the outlet circle of the blade, and regarding the first intersection point of the radial and the first auxiliary circle as a point B; S5, connecting the point A with the point B with a straight line, and cutting in an oblique angle manner; S6, forming a second auxiliary circle by taking the circular center of the wheel disc as the circular center, wherein the diameter of the second auxiliary circle is smaller than that of the first auxiliary circle, and regarding the intersection point of a suction side of the blade and the second auxiliary circle as a point C; and S7, connecting the point B and the point C in an arc transitional cutting manner.