The invention relates to an endoscope stomach volume adjusting band curve degree adjusting device which comprises a handle, an angle wheel and a hose. A rotary shaft is arranged on the handle, one end of the rotary shaft extends into the handle, a pulley is arranged at the end, located in the handle of, the rotary shaft and can rotate together with the rotary shaft, and the angle wheel is arranged at the end, located outside the handle, of the rotary shaft. One end of the hose extends into the handle, an end connecting portion is arranged the other end, a steel wire is arranged in the hose, two ends of the steel wire are fixed to the end connecting portion, and the middle of the steel wire extends into the handle and is connected to the pulley in a wound mode. The angle wheel can drive the pulley to rotate through the rotary shaft, the steel wire is pulled while the pulley rotates, and the bending direction of the hose is controlled. The steel wire arranged in the hose is pulled by turning the angle wheel, and accordingly the purpose of bending the hose is achieved. Visual relevant parts carried during usage of a fiberoptic endoscope are omitted, and the endoscope stomach volume adjusting band curve degree adjusting device is simple in structure, low in cost, convenient to carry and move and very suitable for large-area popularization.