The invention relates to a treating method of paper-making water recycling use in the production process of reconstituted tobacco, aiming at solving the problems that the massive discharge of treated water in the prior art causes pollution to the environment as well as low utilization ratio of water for production and large new-water consumption. The technical key points are characterized by carrying out fiber recovery on the paper-making water, then carrying out sedimentation, leading supernatant overflowing liquid after sedimentation into an ultrafiltration membrane separating system for separation, obtaining dislysate and concentrate, leading the dislysate into a reverse osmosis membrane system for separation again, obtaining purified water and concentrated water; the purified water isreused for water in the production process after treatment of removing off-odor, the recovered fiber is reused into the production process, the sediment is used as solid waste, the concentrate and the concentrated water are treated properly, the ultrafiltration membrane separating system adopts an ultrafiltration membrane with the bore diameter of 10-200nm, the pressure is 0.1-0.5MPa, the temperature of the feed liquid is 10-70 DEG C, the speed of the membrane surface is 2-8m/s, the pressure of the reverse osmosis membrane system is 1.0-10MPa, the temperature of the feed liquid is 20-45 DEG C, and the speed of the membrane surface is 2-7m/s.