The invention discloses rail diagnostic equipment. The rail diagnostic equipment includes a first device body, a telescopic device disposed on the first device body, advancing devices left-right symmetrically disposed on the telescopic device, solar devices disposed at the upper ends of the advancing devices, a diagnostic device disposed on the rear side of the advancing device and a marking device disposed on the diagnostic device. The telescopic device comprises telescopic grooves which are left-right symmetrically form in the first device body and of which openings separately face to the left and right sides, the telescopic grooves are internally provided with telescopic columns which can slide left and right and one ends extends out of the openings, and the outer ends of the telescopiccolumns are fixedly connected with second device bodies. A first connecting block is disposed between the second device bodies which are left-right symmetrically disposed and located on the upper side of the first device body, and first connecting rods are rotatably connected to the end faces of the left and right sides of the first connecting block in a matched mode.