Abstract: In view of the sealing problem of solid waste filling in mine goaf, the following conclusions are drawn through theoretical analysis, field investigation and other methods: (1) To determine the sealing target of solid waste deep well: solid waste deep geological disposal achieves a stable state, and the target of effective sealing period is set as 20 years (reference standard); (2) To put forward a multi-level sealing technology system for solid waste mine filling, which includes regional sealing, surface sealing and filling. (3) Complete high-strength hard rock or expansive soft rock is the ideal surrounding rock for regional sealing; (4) Design a channel sealing structure suitable for solid waste mine filling, which has two functions of support and sealing; (5) To design a multi-level closed technology system for filling solid waste mines in a coal mine.