The utility model discloses a secondary circuit apparatus of an illumination control cabinet. One terminal of button SA1 is connected with a power supply L2 with the voltage of 380 V through a fuse FU1, the other terminal is connected with one terminal of a coil KM1 of a contactor KM2 through a switch; one terminal of a normally open contact of the contactor KM1 is connected with a power supply L1 with the voltage of 380 V through a fuse FU3, and the other terminal is connected with one terminal of an illuminating lamp HR1; the other terminal of the illuminating lamp HR1 is connected with a null line N; one terminal of a normally closed contact of the contactor KM1 is connected with the power supply L1 with the voltage of 380 V through the fuse FU3, and the other terminal is connected with one terminal of an illuminating lamp HG1; and the other terminal of the illuminating lamp HG1 is connected with the null line N. According to the secondary circuit apparatus of the illumination control cabinet, one relay is adopted to control two illuminating lamps in two lines, a secondary circuit wiring mode is adopted, the number of relays and the failure rate of electrical components are reduced, power supplying reliability is raised, and an illumination system can be ensured to be operated normally; and the secondary circuit apparatus of an illumination control cabinet is reasonable in design, simple in structure, low in failure rate, safe and reliable in operation, and can be used in an illumination control cabinet.