Waist clamping support and seat

The utility model relates to the field of seat design and manufacture, in particular to the waist and back design of a seat. According to the technical scheme, the waist clamping support comprises a back frame, a supporting body abutting against the waist and the back of the human body and an elastic body connected with the back frame, the supporting body comprises a main support body and an auxiliary support body rotationally connected with the main support body, the auxiliary support body is connected with the back frame in a sliding mode, and the elastic body is connected with the main support body in a sliding mode. The elastic body is connected with the main support and elastically drives the main support to move in the front-back direction. The utility model aims to overcome the defects in the prior art, and provides the waist clamping support and the seat, the waist support not only can effectively support the waist and the back of a user, but also can provide a dynamic and variable supporting effect,