The invention discloses a chair with functions of warming feet and massaging ankle for office work and study and a working method thereof. The chair comprises a chair surface, a backrest, armrests and legs, wherein a cross rod is arranged under the middle of the chair surface, a fixed seat is arranged under the cross rod, a folding mechanism is connected with the fixed seat, the other end of the folding mechanism is connected with an ankle massage mechanism, the ankle massage mechanism comprises an L-shaped base movably connected with the folding mechanism, an active plate movably connected with one end of the L-shaped base and a power unit arranged between the L-shaped base and the active plate; the powder unit comprises a motor, a gearbox and a cam, the motor is arranged on the L-shaped base, the gearbox is connected with the motor, and the side of the cam is connected with the gearbox, and an acting surface of the cam is connected with the active plate; a heating resistance wire is arranged above the active plate and an insulating layer is arranged above the heating resistance wire; the cross bar is connected with a power line and a power adapter supplying electric power to the heating resistance wire and the power unit. The chair with functions of warming feet and massaging ankle for office work and study is simple in structure and comfortable in use.