The invention discloses a wagon steering wheel for transporting U type or box type precast beams. The wagon steering wheel comprises a base assembly, supporting seat assemblies, pull rod assemblies, baffle assemblies, sole timber and a steering wheel bottom center disc. The steering wheel bottom center disc cooperates with a top center disc of a bearing large bottom frame of a precast beam transporting vehicle set, vertical rotation and longitudinal motion along vehicle bodies can be achieved, and a steering function is achieved. By adjusting the telescopic lengths of thread pull rods in the pull rod assemblies, supporting plate assemblies are driven to rotate around rotary shafts, then the U type or box type precast beams are clamped by supporting cushion assemblies, and the purpose of fastening the U type or box type precast beams is achieved. The steering wheel is a wagon steering wheel device which is used for transporting the U type or box type precast beams device and has steering and fastening functions, can achieve the fastening function of the wagon set for transporting the U type or box type precast beams for the precast beams, and meanwhile can solve the problem about steering of the U type or box type precast beams when the wagon set passes through curves.