The invention provides a phase-change heat pipe type high-power LED lamp. The phase-change heat pipe type high-power LED lamp comprises a heat radiator, a heat sink installed at the bottom of the heat radiator, an LED substrate fixed to the bottom of the heat sink, an LED chip installed on the LED substrate, an end cover fixed to the top of the heat radiator, a filling pipe arranged in the center of the end cover and a heat radiating fin installed on the outer wall of a cavity. The cavity is formed in the heat radiator and filled with a heat exchange working medium, getter fixing strips alternately distributed at intervals are installed on the inner wall of the cavity, and a getter is fixed to the getter fixing strips. The phase-change heat pipe type high-power LED lamp is high in heat radiating efficiency, long in service life and capable of still ensuring the high heat radiating efficiency at a certain inclined angle. The invention further provides a heat radiating method capable of increasing the heat conduction and radiating speed of the phase-change heat pipe type high-power LED lamp.