The invention relates to the technical field of LED illumination, and in particular relates to a method for manufacturing a heat-dissipating optical lamp cup; the method comprises the following steps:1) an optical cup body is prepared and formed from light-transmissive glass through a mold; 2) a planetary rotating frame is prepared, and the planetary rotating frame includes a main rotating shaft,a bracket fixedly connected with the main rotating shaft, and a self-rotating shaft; 3) the optical cup body is fixed on the self-rotating shaft; 4) a magnetron sputtering source and an infrared heating device are arranged in a vacuum chamber, the magnetron sputtering source includes a crucible and a magnetic ring and a tungsten wire emitting hot electron beam; a FeSi2 target material is disposedin the crucible; 5) the infrared heating device is started to heat the vacuum chamber, the vacuum chamber is vacuumized, and a certain pressure of Ar45 gas is added through a piezoelectric throttle valve; 6) the magnetron sputtering source is started to form a FeSi2 clad layer on the outer surface of the optical cup body; and 7) air is introduced into the vacuum chamber, and a SiO2 layer is quickly formed on the FeSi2 clad layer to obtain the heat-dissipating optical lamp cup, and the heat-dissipating effect of the optical lamp cup is greatly improved.