System capable of improving recycled waste emulsion ultrafiltration efficiency by use of pH regulation

The invention relates to a system capable of improving recycled waste emulsion ultrafiltration efficiency by use of pH regulation. The system comprises a waste emulsion holding tank, an ultrafiltration membrane component connected with the waste emulsion holding tank by use of a pipeline, and also a pH value regulating device connected with the waste emulsion holding tank; the pH value regulating device is used for regulating the pH value of a solution in the waste emulsion so that the solution can be weakly alkaline. Compared with the prior art, the system is characterized in that NaOH or dilute sulfuric acid is added to the waste emulsion to regulate the pH to the range of 9-10 so that the waste liquid can be weakly alkaline, next, the waste liquid is fed into the ultrafiltration membrane component by use of a high-pressure pump for ultrafiltration, and then clean water is discharged, while the high-concentration waste liquid is discharged from the other side; as a result, the ultrafiltration effect is greatly improved, and more importantly, the pollution on the membrane due to impurities in the filtration process is reduced, and moreover, the frequency of back washing is reduced and the service life of the membrane is prolonged.