The present disclosure provides a terminal assembly and board end connector. The terminal assembly comprises a plurality of terminals, a terminal insulation body and a conductive plastic. Each of the terminals comprises a terminal body, a plugging end part and a connecting end part. The plugging end part and the connecting end part are provided at two ends of the terminal body. The terminal insulation body covers the plurality of the terminal bodies of the plurality of terminals. The conductive plastic is disposed on one side of the terminal insulation body. A surface of the conductive plastic close to the terminal body is parallel to the terminal body. The SI performance of the board end connector equipped with the terminal assembly of the present disclosure can be improved by paralleling a surface of the conductive plastic close to the terminal body to the terminal body.