Light guide illumination system for underground pipe rack

The invention provides a light guide illumination system for an underground pipe rack. According to the system, sunlight serves as an illumination light source during the day, illumination is also achieved on the interior of the pipe rack when a power supply circuit has a problem, meanwhile, the service life of an electric illumination light source is prolonged, and an electric illumination system can enter an energy saving state to reduce the overall energy consumption in the daytime period. The light guide illumination system comprises a concrete top plate of the underground pipe rack and a concrete pier base of the underground pipe rack. The upper portion of the concrete pier base outwards protrudes out of the upper end face of a soil covering layer on the periphery; an upwards-protruding inner ring wall of a waterproof cap is fixedly arranged on an installation ring face at the lower end of a light collecting cover; an outer ring face of the lower end of the waterproof cap is buckled on an outer ring face