The invention relates to the field of massage chair. A massage chair includes a base, a crus rotating device, a back frame rotating device, a massage device and a control system; the crus rotating device is used for crus rotation; the back frame rotating device comprises a second air cylinder, a U-shaped rotating frame and a back support frame; the U-shaped rotating frame is fixedly connected withthe back support frame, and inner sides of two sides of the back support frame are each provided with a lifting matching groove; two outer sides of the back support frame are connected with two openends of the U-shaped rotating frame; all two sides of the U-shaped rotating frame and two sides of the back support frame are hinged on the base, a first air pump is arranged on the upper part of thebase, and the output end of a first air pump is connected with a cross bar of the bottom of the U-shaped rotating frame; the massage device is used for back massage. The massage chair has the advantages of improving the rotation efficiency of crus rotation, further improving the leg massage, further improving the back massage undulation and beating, further improving the back massage effect and optimizing the massage experience of users.