A connector expansion structure includes a connector and a rear plug. The connector includes a base, a sheet-shaped contact part, a shell-shaped member and a plurality of conductive terminals. The sheet-shaped contact part includes a sheet-shaped structure and an extension structure. The shell-shaped member extends in the normal direction of a first end surface, covers the sheet-shaped contact part, and encloses the ring-shaped structure of the base. The conductive terminal and the rear plug are disposed on the extension structure. The rear plug includes conductive terminal tracks for accommodating the conductive terminals. Two sides of the rear plug block are provided with position-limit tracks and the engagement tracks. Wherein the rear plug is slidable on the extension structure.