The invention discloses a method for enhancing single-layer graphene broadband absorption based on a strong coupling effect, wherein a graphene nanometer strip array is selected as an absorption layer, a metallic channel array as a substrate; a corresponding filling medium is arranged in the metallic channel; graphene surface plasmon resonance is excited through the graphene nanometer strip array;excitation of a magnetic resonance mode is supported through the metallic channel so that hybrid fields generated by strong coupling between the two modes are concentrated at the graphene, finally realizing enhancement of a broadband absorption effect of the graphene, wherein the graphene nanometer strip array used only contacts with one edge of the metallic trapezoid channel array, thereby meeting the resonance condition that excitation of the strong coupling effect requires a relatively high-quality factor graphene plasmon mode. The enhanced absorption broadband in the invention is coveredat the mid-infrared band, has the features of high band pass, low fluctuation, high rate and the like, and can be applied to an integrated all-optical network.