The invention discloses a 30-degree phase-angle difference power distribution line uninterrupted power transfer system loop closing and opening device, which comprises a cabinet body, a CPU (central processing unit), an alternating current unit, a switching value input unit, a switching value output logic unit, a communication unit and a power supply unit, wherein the CPU, the alternating current unit, the switch value input unit, the switching value output logic unit, the communication unit and the power supply unit are arranged in the cabinet body; the communication unit realizes communication of the CPU with the outside; the power supply unit respectively supplies electricity to each unit; the front side of the cabinet body is provided with a touch screen. The loop closing and opening device provided by the invention has the advantages that the voltage current of three switch circuit breakers in the system is collected; position signals of the three switch circuit breakers are collected through the switching value input unit; then, the collecting value is input into the CPU through a data bus; the CPU performs judgment through the logic function and then sends each control signal to the switching value output logic unit through the data bus; the switching value output logic unit performs loop closing and opening operation.