The invention discloses an LED street lamp. The LED street lamp comprises a lamp support and a wind-energy power generating device, the wind-energy power generating device is arranged at the top of the lamp support, and a groove is formed in the top of the lamp support; and a rotary device is arranged in the groove, the rotary device comprises an internally-toothed ring and three planetary gears, the planetary gears are arranged in the internally-toothed ring and engaged with the inner wall of the internally-toothed ring, and four first stop blocks are evenly and symmetrically arranged on the outer wall of the internally-toothed ring. The LED street lamp has the beneficial effects that solar energy and wind energy in the nature can be utilized at the same time, through arrangement of the rotary device, the wind-energy power generating device arranged at the top of the lamp support can rotate more stably along with change of wind directions to generate power, and the wind energy is utilized greatly; and meanwhile, a wind inlet and a wind outlet with an exhaust fan are formed in a lamp base, thus the heat dissipating effect of the LED lamp is ensured by utilizing the simple structure, the service life of the LED street lamp is prolonged, and the maintenance frequency is reduced.