Self-adaptive elastic chair back

The utility model discloses a self-adaptive elastic chair back. The self-adaptive elastic chair back comprises a fixing frame and a chair back body, the chair back body comprises a waist and back supporting part and a plurality of elastic connecting parts, the waist and back supporting part is fixedly connected with the fixing frame, the waist and back supporting part is provided with a plurality of transverse rods and a plurality of grooves which are arranged at intervals in a staggered mode in the vertical direction, a mounting part is arranged between every two adjacent transverse rods, and the mounting parts are located on the two sides of the grooves; the thickness of the mounting part is smaller than that of the cross rod, the elastic connecting part wraps the outer side of the mounting part, the end face of the side, away from the fixing frame, of the elastic connecting part is flush with the end face of the cross rod, and the elastic deformation coefficient of the elastic connecting part is larger tha