Stray current corrosion resistance detection device for metal pipelines along subway

The invention discloses a stray current corrosion resistance detection device for a metal pipeline along a subway, and the device comprises two external members which are provided with through holes matched with the metal pipeline; the two circular insulating pads are arranged in the through holes; the first sleeve and the second sleeve are both arranged on the metal pipeline and can transversely move or rotate relative to the metal pipeline; the balls are rotatably arranged on the first sleeve and the second sleeve respectively; the driving device is arranged on the two sleeve pieces and used for driving the first sleeve and the second sleeve to rotate or transversely move on the metal pipeline at the same time; the control device is used for indirectly controlling the driving device to work; the industrial camera is arranged on the second sleeve; and a wireless communication module. According to the method, the inner wall of the metal pipeline can be photographed while current corrosion can be resisted, so