Cushion capable of adjusting angle of backrest

The cushion comprises a back cushion body and a cushion body, a bottom plate is arranged in the cushion body, a placing hole is formed in the surface of the bottom plate, a medicine placing frame is arranged in the placing hole, a sliding rod penetrates through the surface of the medicine placing frame, one end of the sliding rod is fixed to the end face of the placing hole, and the other end of the sliding rod is fixed to the cushion body. The other end of the sliding rod is sleeved with an extrusion spring, and a blanking cap is arranged in the bottom end of the medicine containing frame. Chinese herbal medicine is contained in the designed medicine placing frame, the Chinese herbal medicine is placed in the frame body to achieve protection and isolation and is prevented from being hardened due to hard extrusion, meanwhile, the medicine placing frame can slide in the placing hole, the comfort of the seat cushion is prevented from being affected, the extrusion spring is designed, the extrusion spring exerts