The invention discloses a polishing assembly for adjusting pressure intensity distribution in an edge area of an optical element. The polishing assembly comprises a planet dual-rotor air pressure transmission device, a joint type auxiliary pressure applying mechanism and a polishing disc. The polishing assembly is characterized in that a concentric circle groove is carved in the back face of the polishing disc; and the joint type auxiliary pressure applying mechanism is composed of a fixed base, a movable joint and a force measuring meter. In the process of polishing the edge area of the optical element, the polishing assembly is used for adjusting pressure intensity distribution in the edge area of the optical element, and therefore material removal amount distribution in the edge area is changed, and the effect of restraining the edge effect is achieved; and in addition, the vibration amplitude can be effectively reduced by the aid of the joint type auxiliary pressure applying mechanism, and therefore confirmability in the polishing process can be improved.