The invention relates to a high-power LED heat radiator, and belongs to the field of LED heat radiation. The high-power LED heat radiator based on a heat pipe technology is characterized in that a gravity heat pipe in the center and sunflower-shaped cooling fins (4) around the gravity heat pipe are included, the gravity heat pipe comprises a middle through pipe (1), an upper cover (2) and a bottom cover (3), the middle through pipe (1) is integrally welded to the upper cover (2) and the bottom cover (3), vacuum is formed in a sealing mode, the space among the middle through pipe, the upper cover and the bottom cover is filled with refrigeration media (5), the cooling fins (4) are arranged around the through pipe (1), a plurality of evenly-distributed protruding groove emulsion structures (6) are arranged in the portion, in the through pipe, of the upper surface of the bottom cover (3), a sealing hole (7) is formed in the middle of the upper cover (3), and the lower portion of the bottom cover (3) is connected with an LED lamp. The structure of overall vacuum sealing and the surrounding cooling fins is adopted, the heat conduction efficiency of the heat pipe is improved, heat radiation is fast, the size is small, and the service life is long.