The invention discloses a method for improving the heat radiating efficiency of an LED lighting source and an integrated radiator. The method comprises the steps as follows: an LED chip substrate is mounted in a substrate groove of a heat pipe radiator, so that heat produced by the LED lighting source is conducted to an evaporation end of a cylindrical straight heat pipe in the radiator, a working medium in the heat pipe absorbs the heat and produces liquid-vapor phase transition, produced vapor is spread to a whole heat pipe body under the action of differential pressure inside the heat pipe, and further the vapor exchanges heat with a surrounding environment through the heat pipe wall and radiating fins on the pipe wall; and the vapor is attached to the inside of a liquid suction core of the pipe wall after condensed into droplets and flows back to the evaporation end of the heat pipe under the action of the differential pressure inside the wick, so that circulatory heat radiation is realized. The radiator comprises a heat pipe radiator substrate (1), the cylindrical straight heat pipe (2), the radiating fins (3), a heat pipe end cover (4), the webby wick (5) and a rubber gasket. The radiator is simple in structure and good in radiating effect.