The utility model relates to a lighting electricity-economizer circuit which comprises a main circuit and a control circuit. The main circuit and the control circuit consist of a circuit breaker, a switch, two auxiliary relays, three contactors, a fuse and an auto-transformer which are connected by circuits. The lighting electricity-economizer circuit forms conversion between two states of power saving and bypass, ensures continuity, reliability and safety of lighting, eliminates the concern about that fault state of the lighting electricity economizer affects lighting, expands application fields of the lighting electricity economizer and maximally utilizes electricity saving function of the lighting electricity economizer at source. The lighting electricity-economizer circuit has simple design and fabrication process, and convenient equipment operation.