The invention discloses preparation of a composite organic silicone resin coating layer using melamine as a transition layer. The method comprises the following steps: firstly, dissolving the melamineinto ethylene glycol to prepare a saturated melamine solution, soaking an aluminum alloy into the saturated melamine solution for a period of time, taking out the soaked aluminum alloy, and performing curing to obtain a melamine film; secondly, dissolving KH560 into a NaOH solution to make the KH560 completely hydrolyzed to obtain an organic silica sol; thirdly, mixing epoxy resin E51 and a curing agent DDS under stirring to obtain epoxy resin glue; and finally, uniformly coating the melamine film with the organic silica sol and the epoxy resin glue, and performing curing to prepare a sampleof the melamine-organic silicone composite coating layer. According to the preparation disclosed by the invention, combination of the coating layer and a substrate can be improved, the corrosion resistance of the coating layer can be improved, and the preparation has the characteristics of a simple preparation process, low costs of raw materials and a wide application range.