Powder selecting and returning mechanism for mine flour mill

A powder selecting and returning mechanism for a mine flour mill effectively solves the problem that the quality of finished products is affected due to the fact that the finished products contain powder exceeding the granularity requirement. Comprising a main body, the side edge of the bottom of the main body is provided with a feeding port connected with a discharging port of the flour mill, the bottom in the main body is provided with a first fan, the main body is internally provided with an inclined screen, and the upper side of the bottom of the screen is provided with a material returning pipe extending out of the main body and connected with a material returning port of the flour mill; a first discharging pipe extending out of the main body is arranged on the lower side of the upper portion of the screen, a second fan is arranged at the upper end of the main body, a second discharging pipe is arranged on the side edge of the upper end of the main body, and the first discharging pipe is connected into t