The invention discloses a steering column, a steering mechanism and a vehicle, and belongs to the field of vehicles. The steering column comprises an upper steering shaft, a lower steering shaft, an upper column pipe, a lower column pipe, an upper installation support, a lower installation support, a crushing force adjusting device and a lower support collapse structure. The upper steering shaft and the lower steering shaft are fixedly connected through an injection pin; the upper installation support and the upper column pipe are fixedly connected; the upper column pipe and the lower column pipe are connected through the crushing force adjusting device; the lower installation support is connected with the lower column pipe through the lower support collapse structure; when a traffic accident of car crash occurs, the upper column pipe and the lower column pipe collapse; and when the upper column pipe and the lower column pipe collapse to the limitation, if the impact force on the front portion of the vehicle and acting force of a driver impacting a steering wheel continue to be increased, the lower support collapse structure makes the lower column pipe continue to descend relative to a vehicle instrument beam, the mutual acting force between the steering wheel and the chest of the driver is buffered, and harm to the chest of the driver is reduced.