Automobile engine driving shaft

The utility model provides an automobile engine driving shaft, and belongs to the technical field of automobile engines. The automobile engine driving shaft solves the problem that the traditional driving shaft is inconvenient to produce without providing a spline groove for a manufacturing worker to more visually produce the driving shaft. The automobile engine driving shaft comprises a step shaft body, wherein the step shaft body is respectively provided with a step part I and a step part II which are connected with a transmission gear; the outer diameter of the step part II is larger than the outer diameter of the step part I; the peripheral wall of one end, which is connected with the step part I, of the step part II is provided with two annular mark grooves along the peripheral direction of the step shaft body; the two mark grooves are spaced; a cylindrical lug boss capable of being provided with the step shaft body in a positioning way is axially arranged on the other end of the step part I in an extend