Coal mine goaf filling device

The utility model discloses a coal mine goaf filling device which comprises a filling assembly, the filling assembly comprises an inner sleeve and a horn mouth, the horn mouth is provided with a fixing assembly, the fixing assembly comprises a supporting ring and a fixing plate, one side of the horn mouth is provided with a material injection assembly, and the material injection assembly comprises an inlet pipe and an electromagnetic valve. A telescopic assembly is installed on the outer side of the inner sleeve and comprises a sliding sleeve and an outer sleeve, and a pressure control assembly is installed on the other side of the horn mouth. According to the coal mine goaf filling device, the height of the device can be adjusted according to the height of the area, assembling work does not need to be conducted on site, the working efficiency is improved, and the filling device can be recycled; according to the invention, the structure is simple, the cost required by filling operation is reduced, sufficient