Process for filling coal mine goaf

The invention discloses a process for filling a coal mine goaf, comprising the following steps: feeding cement, gangue and water in a stirring tank; stirring into filler pulp; and transferring the filler pulp into the mine goaf in a gravity manner. According to the process for filling the coal mine goaf, the gangue is taken as a main filling material, cement and water are used as auxiliary materials, and water is added for filing. The gangue, cement and flyash used for filing the mine goaf are easily obtained from the mine, and the filler pulp which is prepared by stirring in the coal mine goaf filling process has convenient concentration adjusting.