Office extensible massage chair

The utility model belongs to the technical field of massage chairs, and particularly relates to an office extensible massage chair which comprises a chair seat, rotating shafts are fixedly mounted ontwo sides of the chair seat, the same chair back is rotatably sleeved on the two rotating shafts, torsion springs are movably sleeved on the rotating shafts, one ends of the torsion springs are fixedly mounted on the chair seat, and the other ends of the torsion springs are fixedly mounted on the chair back. First hinge seats are fixedly installed at the two ends of the bottom of the side, close to the center of the seat, of the seat back, the first hinge seats are located below the seat, a first installation block and a second installation block are fixedly installed at the bottom of the seat, and a limiting groove located between the first installation block and the second installation block is formed in the bottom of the seat. A same threaded rod is rotationally mounted between the first mounting block and the