This invention provides a chair frame with high strength and high stability, including a base front supporting tube, a base rear supporting tube, a base right supporting tube and a base left supporting tube. A pedal support is connected to a front driving tube through a connecting rod mechanism. Two ends of a main motor telescopic rod mechanism are respectively fixed to the front driving tube and the base rear supporting tube. Two ends of a backrest motor telescopic rod mechanism are fixedly connected to a backrest front driving tube and a backrest rear driving tube. An upper frame is fixedly connected to a connecting piece thereof. The base right supporting tube and the base left supporting tube are fixedly connected to a connecting piece thereof. Two sides of the front driving tube are further connected to a clamping piece.
