The invention relates to a high-power LED (light-emitting diode) lamp which is high in radiating speed, good in dustproof effect, light in weight, low in energy consumption, and long in service life. The high-power LED lamp comprises an LED light source module, a steam liquid phase-change finned heat-pipe radiator, a radiating fan, a dustproof air filter, a back blowing sewage-disposing fan, an air inlet clapboard, an air guide hole clapboard, an air guide pipe, a maintenance hole, a constant current LED power driver, a protective glass, an air inlet area, a radiating area, an air-exhausting area, a light source area, an air inlet, an air outlet, and a rain-proof plate which are packaged integrally, wherein the high-power LED lamp is assembled in a shell through the light source area, the radiating area, the air inlet area and the air-exhausting area; the LED light source module, the steam liquid phase-change finned heat-pipe radiator, the radiating fan, the dustproof air filter, the back blowing sewage-disposing fan and the constant current LED power driver are integrally packaged; and the back blowing sewage-disposing fan is arranged in the radiating area.