A sealing process of LED modules, comprising: (1) a waterproof wire goes through a wire-through hole of a
heat sink to be connected with a positive-negative solder joints on a PCB board, wherein the positive-negative solder joint and the position that the waterproof wire going through are subjected to glue sealing treatment, and a waterproof sealing process is operated between the waterproof wire and the wire-through hole; (2) fix the PCB board on the
heat sink; (3) place one sealing ring into one of the grooves; (4) apply evenly a ring of liquid
silica gel along the other groove of the lens set and the amount of the liquid
silica gel is limited to completely sticking the
solid silica gel sealing ring; (5) the
heat sink installed with the PCB board and the waterproof wire as processed in step (2) is inversely buckled on the lens set which is set with the
solid silica gel ring and the liquid silica gel as processed in step (4), so as to fix the heat sink entirety and the lens set. At least two waterproof sealing rings are used for completely isolating an LED
chip from the outside so as to prevent all
water vapor or other harmful gases from corroding the
chip and the PCB, and the sealing rings are firmer when being compared with thin film sealing; the service life is longer and the guarantees to the sealing performance between the lens set and the heat
radiation frame are realized.