The invention relates to a process technology for recycling water in membrane bioreactor (MBR) membrane treatment of landfill leachate. Through combination of a degradation effect of a conventional facultative tank and an advanced membrane separation technology, the landfill leachate can be effectively treated and reused; the floor area of a membrane bioreactor is small, the quality of the effluent is good, no secondary sedimentation tank is arranged, and operation and maintenance are simple. Community residence waste and domestic wastewater leachate are recycled after being treated, so that awater pollution problem can be solved, water resources can be recycled, full circulation of water resources in an area is realized to the maximum extent, and a purpose of energy conservation and emission reduction is achieved.