The invention provides an angle regulating device, which comprises an operating mechanism, a gear transmission mechanism and an operation table. The operating mechanism comprises a first shaft, a handle, a gear disc, an pointer and a dial, wherein the dial is arranged on the operation table, the first shaft is pivotally mounted on the dial, the handle, the gear disc and the pointer are fixedly mounted on the first shaft coaxially, and the pointer is located on one side of the dial which is marked with scales. The gear transmission mechanism is mounted in the operation table and comprises an input shaft provided with a first gear and an output shaft provided with a second gear, wherein the gear disc meshes with the first gear, and the second gear is in transmission meshing with the first gear. Actual rotation angles of a fuel regulating accelerator and / or guide vanes of an engine can be determined accurately with the angle regulating device, thereby facilitating performance analysis of the engine. Meanwhile, the accuracy of the rotation angles is improved by the aid of a fine regulating mechanism arranged additionally, thereby facilitating performance analysis of the engine further.