Abstract: The pollution sources in municipal drainage pipe networks are usually diversified. It is of great difficulty to distinguish the various pollution sources. Generally, if the pollution sources are not well identified, the pertinence of pollution control might be impaired. Therefore, it is likely that the mitigation effects will not be satisfactory. Up to now, there still lacks a systematical overview with a focus on the present pollution source identification technologies in municipal drainage pipe networks, which might make it difficult to determine the corresponding traceability technologies according to the pollution scenes quickly and accurately. The existing pollution source identification technologies in municipal drainage pipe networks were systematically reviewed, including the physical investigation, marker species, and water fingerprinting methods, etc. The principles and application status of each typical pollution traceability technology for pipe networks are well illustrated. In addition, the pros and cons of each technology and its application scenarios were compared. At last, the future research orientation of pollution identification technologies in pipe networks was prospected. Aiming at the dislocation of pollution sources in the drainage pipe networks, it was required to apply physical investigation primarily, and then to couple the numerical simulation, water fingerprinting, and marker species methods. Therefore, the target pipe sections, possible discharge industries, and specific drainage entities could be determined. The production, transportation, and discharge characteristics of pollutants could be further clarified using the stable isotope method. This study could provide fundamental support for the efficient identification of the location, intensity, and discharge process of the pollution sources.