The invention relates to a railway crane. The railway crane comprises two bogies, a bottom frame, a rotating table, a stretchable lifting arm and a supporting mechanism, wherein the bottom frame is arranged at the upper ends of the two bogies, the rotating table is rotatably arranged at the upper end of the bottom frame, one end of the stretchable lifting arm is connected with the rotating table,the supporting mechanism is connected with the bottom frame, the lifting arm comprises at least two expansion joints, in every two adjacent expansion joints, a bearing area is formed at the lower partof the inner wall of the end, facing the inner expansion joint, of the outer expansion joint, a cross section of each bearing area is arc-shaped, and a plurality of sliding blocks are arranged in parallel along the circumferential direction of each bearing area. According to the railway crane, the dead weight can be effectively reduced, so that the railway crane can be suitable for carrying out rescue operation on a high-speed railway bridge and line, the rescue time can be effectively shortened, and the rescue requirements can be met.