The invention belongs to the technical field of bridge construction and relates to a construction process for a composite structural layer of a long-span cable structure bridge deck. The constructionprocess for the composite structural layer of the long-span cable structure bridge deck is characterized in that the main steps comprise epoxy asphalt bonding layer construction, cast asphalt concreteconstruction and epoxy asphalt concrete construction. The construction process for the composite structural layer of the long-span cable structure bridge deck has the advantages that the bonding strength is high, diseases such as delamination and sliding are not easy to generate, the waterproof performance is good, the composite structural layer is not easily permeable to cause corrosion of a steel plate, the service life of the bridge is prolonged and so on; the experience is accumulated for the domestic steel bridge deck pavement construction, and the service life of the steel bridge deck pavement satisfies design requirements.