The invention discloses a rail-mounted hydraulic steel pipe transporting trolley, and aims to solve the technical problems that in the transporting process, an existing steel pipe transporting trolleyis not likely to dismount a pipe, a pipeline is likely to run up against a wall, and a steel pipe is likely to deform. The rail-mounted hydraulic steel pipe transporting trolley comprises a transporting trolley girder, road wheels, a pipe penetrating device, a pipe supporting device, horizontal adjusting devices and a hydraulic pump station, wherein the pipe penetrating device is arranged at thefront end of the transporting trolley girder; the pipe supporting device is arranged above the transporting trolley girder; the horizontal adjusting devices are arranged on the left side and the rightside of the transporting trolley girder. The rail-mounted hydraulic steel pipe transporting trolley has the advantages that in transporting, the transporting trolley can be vertically and horizontally adjusted, the rail-mounted hydraulic steel pipe transporting trolley can be adapted to narrow tunnels and can solve the problem that since a rail is unsmooth in laying and twisted, the rail-mountedhydraulic steel pipe transporting trolley runs up against the wall in transporting, steel pipe supporting adopts internal supporting, the steel pipe is not likely to deform and can be adapted to be transported in smaller space, the transporting trolley is internally provided with a spontaneous motor, can realize remote distance transportation in a tunnel, and therefore, the rail-mounted hydraulicsteel pipe transporting trolley is arranged in a more advanced and humanized manner.