The invention discloses a termination box suitable for the in-situ reformation of a ring main unit. The termination box comprises the ring main unit and a side cabinet, wherein the side cabinet consists of three parts of a terminal strip chamber, a DTU (Date Transfer Unit) chamber and an optical transceiver chamber; a terminal strip is arranged in the terminal strip chamber; the terminal strip comprises a wiring terminal base plate; a circular arc type connecting copper bar is arranged in the wiring terminal base plate; the circular arc type connecting copper bar is provided with multiple rectilinear sections and multiple circular-arc sections; the radian of each circular-arc section is 90 degrees; the rectilinear sections of the circular arc type connecting copper bar are provided with bolt type wiring posts; the bolt type wiring posts and the circular arc type connecting copper bar are all coated with conducting polyaniline material; a wireless communication module comprises a CPU (Central Processing Unit) control module, a communication power supply module, a wifi (Wireless Fidelity) communication module and a GPRS (General Packet Radio Service) communication module; the wifi communication module is connected with a cloud-side server through the GPRS communication module or multiple wifi hot spots, and periodically updates a wifi account password list from the cloud-side server. By using the termination box, the in-situ reformation can be carried out on an old ring main unit; a limited space is sufficiently utilized; the fit extent of a contact surface is effectively improved; the contact resistance is decreased; the occurrence of electric arcs is decreased; the signal loss is reduced; the safety and the signal stability of a power distribution device are improved; the transmission timeliness of data is guaranteed.