An adjustable neck brace is provided, including: a neck collar, including a sliding engaging groove, the sliding engaging groove extending in an extension direction and having a first engaging portion; a single positioning mechanism, attached to the neck collar and movable along the sliding engaging groove, having a second engaging portion, the second engaging portion being releasably positioningly engaged with the first engaging portion; a chin support, relatively movably connected to the neck collar; at least one connecting member, connecting the positioning mechanism and the chin support.
展开▼
