The invention provides a transmission structure of an automobile cam, and belongs to the technical field of automobiles. The transmission structure solves the technical problem that an existing automobile camshaft can only output one cam profile so that timing phase change and wrap angle change cannot be realized. An automobile includes a camshaft and a cam. The automobile is characterized in thatthe transmission structure includes an eccentric wheel and an outer driving wheel, and the eccentric wheel and the cam are rotatably arranged on the camshaft in a sleeving mode; the eccentric wheel comprises a main wheel body which forms an eccentricity with the camshaft, the outer peripheral surface of the main wheel body is a cylindrical surface, and the outer driving wheel is rotatably arranged on the outer peripheral surface of the main wheel body in a sleeving mode; when the camshaft rotates, the outer driving wheel can be driven to rotate around the eccentric wheel, a transmission structure body is arranged between the outer driving wheel and the eccentric wheel, and the transmission structure body can enable the outer driving wheel and the eccentric wheel to move synchronously; anda driving structure for driving the eccentric wheel to rotate around the camshaft is connected to the eccentric wheel. The transmission structure of the automobile cam can realize the timing phase change and the wrap angle change, and improves the performance of an engine.