The invention discloses a combined technology for treatment and recycle of production sewage. The combined technology for treatment and recycle of production sewage comprises sewage pretreatment, sewage depth treatment and sewage desalination treatment. A process flow of the combined technology comprises that sewage is orderly treated by a grille, a sewage adjustment tank, an air floatation tank, a sedimentation tank, a fiber filtration unit, a sand filtration water inlet station, a sand filtration device, a water collecting tank, an ultrafiltration elevator pump, a self-cleaning filter, an ultrafiltration device, an intermediate water tank, a reverse osmosis elevator pump, a clear water tank, a reuse water elevator pump and a reuse water tank. The combined technology utilizes steel enterprise production sewage as a water source and mainly adopts an air floatation tank-sedimentation tank-fiber filtration unit-sand filtration device-ultrafiltration device combined way before a reverse osmosis desalination process. The combined technology can effectively remove oil pollutants, organic matter pollutants, colloid pollutants and suspension pollutants in sewage, improve reverse osmosis feed water quality, reduce chemical cleaning frequency of a reverse osmosis membrane, increase a service life of the reverse osmosis membrane, and reduce an operation cost.