The composition of glass fiber wastewater is complex, containing pollutants such as infiltration agent residues, suspended particles, organic waste and fiberglass waste. The biochemical properties are poor, and it is difficult to effectively degrade directly through the metabolic activities of microorganisms, and it is relatively difficult to deal with. Due to the increase in production and capacity expansion of a glass fiber production enterprise, the water volume and water quality of sewage treatment have changed significantly. In order to solve the bottlenecks brought about by the original sewage treatment process and meet the environmental protection requirements of standard discharge, the technical transformation and upgrading were carried out on the basis of the original deep treatment equipment, add a set of pressurized dissolved gas flotation device between the production adjustment tank and the flocculation sedimentation tank, and adopt "regulation tank + air flotation + flocculation precipitation + hydrolysis acidification + Two-stage A/O + two-sedimentation tank + high-density pool + ultrafiltration" process, after being put into operation, can more effectively remove suspended matter, grease, colloids, etc. in wastewater, and at the same time reduce the subsequent amount of drug addition and sludge output, and achieve good results.