The invention discloses an efficient filling mining method for an extra-thick 
coal seam. The method comprises the following steps that mining and filling key technical parameters are determined; a roadway and a mining and filling production 
system are arranged; a mining and filling connection sequence is determined, milling type 
coal mining is carried out, a long "ship"-shaped deep groove goaf isconstructed, the goaf is filled, and the goaf is filled close to back; and safe and efficient mining of the extra-thick 
coal seam, low-cost and efficient filling of 
coal gangue and the like and effective protection of the 
ecological environment are achieved. The method can improve the 
coal mining capacity, reduce the 
coal mining cost, simplify the mining and filling connection relation, improve the filling capacity, guarantee the mining and filling safety, optimize the filling space structure, achieve full-
volume filling of the goaf, simplify the filling process 
system, reduce the filling cost, expand the filling mining application range, liberate stagnant coal resources, improve the mine 
recovery rate, efficiently fill the ground and the underground 
coal gangue at low cost, solve the ecological 
environmental protection problem, and achieve coal 
resource development and utilization optimization and 
ecological environment influence minimization on the whole.