The utility model relates to a temporomandibular joint tractor and a boosting device of the temporomandibular joint tractor, the boosting device comprises a pull-down piece, a positioning piece and anadjusting assembly, the pull-down piece is provided with a hook part used for hooking a lower gum, and the adjusting assembly is connected with the positioning piece; the adjusting assembly is used for driving the pull-down piece to move relative to the positioning piece so as to pull the lower gum towards the front lower portion through the hook part of the pull-down piece, a gap between temporomandibular joints is pulled open, and therefore a user can conveniently open the mouth at a larger angle, the temporomandibular joint tractor can conveniently open the mouth of the user at a larger angle, and the temporomandibular joint traction exercise effect is improved.