The utility model relates to a roof beam platform truck is transported by oneself to rail mounted, it contains frame (1) of compriseing roof beam system with great ease girder (5) and crossbeam (6) its characterized in that all be provided with away below the tip of girder (5) road wheel case (2) it is provided with action wheel assembly (3) and follower assembly (4) on road wheel case (2) respectively to walk, action wheel assembly (3) are including installing initiative wheel (7) in walking road wheel case (2) and passing initiative wheel (7) and carry out driven initiative axletree (8), the output that shaft coupling (13) and speed reducer (14) are passed through to the one end of initiative wheel (8) links to each other, speed reducer (14) are through connecting seat (12) with to walk road wheel case (2) fixed. The utility model discloses can make things convenient for the collision of large size or different in nature component to stack, adapt to different construction environments, reduce the danger of operation, accord with green low -carbon environmental protection theory simultaneously.