Automobile door hinge mechanism and automobile

The utility model provides an automobile door hinge mechanism and an automobile. The automobile door hinge mechanism comprises a first hinge and a second hinge, wherein the first hinge is connected with an automobile body, the second hinge is connected with an automobile door, the first hinge and the second hinge are in rotating connection through a pin shaft assembly, a hole of the preset depth is formed in the first preset surface of the first hinge, a ball is arranged in the hole, a spring connected with the ball is arranged in the hole, the other end of the spring is fixedly connected with the bottom end of the hole, the preset depth is smaller than the value of the thickness of the preset surface, the diameter of the ball is greater than or equal to the size of an opening of the hole, a groove corresponding to the hole is formed in the second preset surface, making contact with the first preset surface, of the second hinge, and when the automobile door is opened to be at the preset position, the ball extends out of the hole under action of the spring and is clamped in the groove. The hinge mechanism achieves the functions of rotation of the automobile door and limitation of a limiter at the same time, the structure is simple, one process is omitted for the automobile assembly processes, the cost is reduced, and the production rhythm is accelerated.