The invention provides a method for describing a carbonate rock fracture-cavity connecting body. The method comprises the steps of determining multiple attribute data volumes used for describing large-scale fractures, small-scale fractures and karst pores-cavities; performing spatial numerical coupling on the multiple attribute data volumes to obtain a coupled data volume; and describing the carbonate rock fracture-cavity connecting body according to the obtained coupled data volume. According to the method provided by the embodiment of the invention, spatial numerical coupling can be performed on the data volumes, a connection relation between fracture-cavity reservoir bodies can be established, a boundary range of the connecting body can be defined, and a scientific basis can be providedfor reasonably dividing fracture-cavity development units and improving water injection and gas injection effects.