The utility model discloses a UPS (Uninterrupted Power Supply) alternating current power source type circuit breaker control loop and relates to an electric control power source device which uses the UPS alternating current power source as the circuit breaker control loop. The circuit breaker control loop comprises a UPS alternating current control power source and a circuit breaker control loop, wherein the UPS alternating current control power source and the circuit breaker control loop are electrically connected to form an alternating current power supply circuit; the circuit breaker control loop comprises an alternating current frame circuit breaker and an alternating current indicator lamp; coil parts of the alternating current frame circuit breaker are connected at two ends of the UPS alternating current control power source in parallel; the alternating current frame circuit breaker and the auxiliary contact of a relay are connected in a decentralized control system DCS; the alternating current indicator lamp and the auxiliary contact of the alternating current frame circuit breaker are connected in series and then are connected at two ends of the UPS alternating current control power source. With the adoption of the UPS alternating current power source type circuit breaker control loop, the reliability of the power source can be met, and the input cost can be saved; in addition, the UPS alternating current power source type circuit breaker control loop has the advantages of simplifying the system, reducing rooms, having low implementation cost and the like and is convenient to operate, and the UPS alternating current power source type circuit breaker control loop is already applied to flue gas desulfurization devices of power plants.