Urban rail transit stray current detection device

The utility model relates to the technical field of detection equipment, in particular to an urban rail transit stray current detection device, which comprises a detection display, a first far-end detection extension and a second far-end detection extension, wherein the detection display is used for jointly acquiring and detecting potential difference, polarization voltage, rail longitudinal resistance and rail transition resistance between a rail and a grounding grid. The detection display host, the first far-end detection extension and the second far-end detection extension cooperate with each other to form a whole set of detection system, the operation is convenient, the measurement of the transition resistance and the longitudinal resistance of the steel rail is completed quickly, the operation is simple, and the data is accurate; meanwhile, the system has the following functions of recording a test section, test time and test parameter values in real time, simply performing data analysis and data out-of-