The invention discloses an environment-friendly street lamp having the function of introducing sunlight to underground. The environment-friendly street lamp having the function of introducing the sunlight to underground comprises a lamp top, light collecting devices and a light-catching cover and is characterized in that the lower end of the lamp top is fixedly provided with two symmetrically arranged supporting rods, reflectors are arranged on the light collecting devices, first connection blocks are fixed to the lower ends of the reflectors, fixing rods are hinged to the lower ends of the first connection blocks, the lower ends of the fixing rods are fixed to sliding plates, a push rod is fixed to the left end of each sliding plate, the left end of each push rod is fixed to an air cylinder, the left side of the upper end of each sliding plate is fixedly provided with a third connection block, an air cylinder telescopic rod is hinged to the upper end of each third connection block, the upper end of each air cylinder telescopic rod is hinged to a second connection block, the upper end of each second connection block is fixed to the corresponding reflector, the lower end of the light-catching cover communicates with a light guide pipe, and the lower end of the light guide pipe is provided with a florescent lamp. The environment-friendly street lamp having the function of introducing the sunlight to underground is uniform in light spreading, large in illuminating area and environmentally friendly, saves energy, meets the current energy conservation and emission reduction theme, avoids influencing the structure safety of a building and has a good light collecting effect.