The invention relates to a temporomandibular joint traction apparatus and a boosting device thereof. The boosting device comprises a pull-down component, a positioning component and an adjusting assembly. The pull-down component is provided with a hook for hooking lower gums, and the adjusting assembly is connected with the positioning component. The temporomandibular joint traction apparatus andthe boosting device have the advantages that the adjusting assembly is used for driving the pull-down component to move relative to the positioning component, so that traction can be carried out on the lower gums towards the front lower sides by the hook of the pull-down component, gaps between temporomandibular joints can be opened, users can conveniently open the mouths at large angles, distraction can be conveniently carried out on the mouths of the users at large angles by the temporomandibular joint traction apparatus, and temporomandibular joint traction exercise effects can be improved.