Portable maintenance tool for urban rail vehicle

A portable overhauling tool for urban rail vehicles comprises an urban rail vehicle overhauling tool body and conical rods, the right side of the urban rail vehicle overhauling tool body is connected with the conical rods in a clamped mode, and the right ends of the multiple conical rods are fixedly connected with a first jaw, a second jaw, a third jaw and a fourth jaw respectively. And a convenient mechanism is arranged in the urban rail vehicle overhauling tool main body. Then a user rotates the handle, the handle drives the sliding rod to rotate, the sliding rod drives the screw rod to rotate, the screw rod drives the threaded block to move leftwards, the threaded block drives the sleeve rod to move leftwards along the outer wall of the cross rod, and the sleeve rod is rotated to fasten the urban rail vehicle bolt; the main body of the urban rail vehicle maintenance tool is contracted, so that the length of the wrench is reduced, the number of carried wrenches is reduced by replacing the first jaw, the sec