Steering transmission shaft and vehicle

The utility model relates to a steering transmission shaft and a vehicle. The steering transmission shaft comprises an inner shaft and a first shaft sleeve which is arranged outside the inner shaft ina sleeving mode and can relatively move in the axial direction. The inner shaft comprises a first shaft section used for being connected with a universal joint. Wherein the first shaft section is inspline connection with the first shaft sleeve, the second shaft section is in spline connection with the first shaft sleeve, the extension shaft section is connected with the second shaft section, theextension shaft section forms a divergent section with the shaft diameter gradually increased, and the end of the divergent section can abut against the end face, connected with the first shaft sleeve, of the second shaft section. Therefore, the inner shaft and the first shaft sleeve can relatively move along the axial direction; the telescopic performance of the steering transmission shaft is realized; the design requirem