Device for measuring angle position of rotating element

The utility model relates to a device for measuring the angle position of a rotating element, which comprises a light source, optical detectors, the rotating element and a diffuse reflection element synchronously swinging along with the rotating element, wherein the position relation among the light source, the optical detectors and the diffuse reflection element achieves the purpose that when the rotating element swings within the scope of an swinging angle, light beams diffusively reflected by the diffuse reflection element can reach the optical detectors distributed on two sides of the light source, and the areas of the light beams diffusively reflected by the diffuse reflection element to the optical detectors vary from the swinging angle. Light emitted by the light source is directly reflected to the diffuse reflection element and then reflected to the optical detectors through the diffuse reflection element; and the optical detectors are used for photoelectric conversion according to the areas of the li