Downhole direct current lighting system

The utility model discloses an underground direct-current lighting system which comprises a direct-current stabilized power supply, the direct-current stabilized power supply is provided with an alternating-current input end and a direct-current output end, and the direct-current output end is connected with a direct-current power supply circuit. And the direct-current power supply circuit is connected with the lamps through a switching device and a direct-current transformer in sequence. The DC stabilized power supply comprises a box body, and a rectifier bridge, a filter capacitor, an IGBT module, a main transformer, a fast recovery module, a filter module, a DSP chip and a power panel are arranged in the box body. According to the utility model, alternating current is converted into direct current, the direct current is output to the lamp after voltage reduction, so that the problems of three-phase imbalance and large power transmission loss in an alternating current power supply line are solved, energy is