The invention discloses an LED (Light-Emitting
Diode) energy-saving lamp, which is formed by connecting a lamp head, a lamp holder and a light-emitting body from top to bottom. The light-emitting body comprises a
metal column body which has heat conduction and is provided with a polygonal section, an
aluminum substrate distributed with an LED
light source, and a fixing plate for mounting the
metal column body on the lamp holder; the
aluminum substrate is in a long strip shape and is adapted with the shape of any outer side face of the
metal column body; two ends of the
aluminum substrate are fastened on the outer side face of the metal column body through a screwing manner; the metal column body is fixedly arranged on the fixing plate through the screwing manner; the metal column body is in a hollow structure; the fixing plate is provided with an air ventilating hole and the lamp holder is integrally provided with a heat
radiation through hole; and the hollow structure, the air ventilating hole and the heat
radiation through hole are communicated. The column body is made of heat-conducting metal; the aluminum substrate and the metal column body are fixed through the screwing manner, and the metal column body and the fixing plate are fixed through the screwing manner, so that the heat is rapidly transmitted to the whole metal column body and the fixing plate. The hollow structure, the air ventilating hole and the heat
radiation through hole are communicated with one another, so that the heat can be radiated in time through the flowing of the air.