Provided is a natural gas well sand separating device. A main body of the natural gas well sand separating device is composed of two sections of drum bodies of different diameters. The drum body of the small diameter is a sand eliminating section drum body, and the drum body of the large diameter is a settling section drum body. The two drum bodies are fixedly connected through an end socket. A natural gas mixture inlet is communicated with the middle of the sand eliminating section drum body, and a natural gas outlet is formed in the top of the sand eliminating section drum body. A gas condensate outlet is formed in the lower portion of the sand eliminating section drum body, the large end of the end socket is fixedly connected with the settling section drum body, and the small end of the end socket is fixedly connected with a sand discharging opening. The centrifugal separation concept is adopted in the sand eliminating technology in the natural gas well sand separating device, the two sections of drum bodies of different diameters form the main body of the sand separation device, and therefore the main body is divided into the sand eliminating section and the settling section. The natural gas well sand separating device is compact in structure, and low in device investment. The natural gas well sand separating device integrates the functions of natural gas, oil, gas, water, and sand eliminating and other physical separation functions, and compared with an initial combined system of a three-phase separator and a settling tank, the natural gas well sand separating device improves separation efficiency and saves device investment.