The utility model discloses an adjustable multifunctional ergonomic chair which comprises a chair seat, the lower surface of the chair seat is fixedly connected with a connecting frame, the back surface of the connecting frame is fixedly connected with a mounting plate, the inner wall of the mounting plate is in threaded connection with a screw rod, one end of the screw rod is movably connected with a limiting sleeve, and the other end of the screw rod is movably connected with a connecting rod. According to the adjustable multifunctional ergonomic chair, the rotating
handle is pinched by hands, the screw rod is rotated, so that the
tail bone support moves forwards or backwards on the chair seat, the
tail bone support is adjusted to a proper position, a user can sit on the
cushion of the chair seat at the moment, the protruding part of the
cushion can be attached to the
tail bone support, and therefore the user can sit on the adjustable multifunctional ergonomic chair. After a user sits down, the raised line on the tail bone support is just located at the position of a hip groove and is attached to the tail bone for supporting, and the arc-shaped block on the tail bone support is used for supporting the bottom of the
lumbar vertebra, so that the bottom of the
lumbar vertebra and the spine tail bone of the user of the ergonomic chair are supported,
waist ache after long-time sitting is reduced, and the spine tail bone is prevented from being damaged.