The invention, which belongs to the technical field of recovery technology enhancement, relates to a high-strength fracture-cavity core and a manufacturing method thereof. Three substances including CaCO3, MgCO3 and FeCO3 are added into a core raw material to conform to physical characteristics of the carbonatite fracture-cavity oil deposit. According to the invention, beta-D-glucose crystal is used as a filler; after core gluing, a fracture-cavity structure in the core is formed by using high-multiple formation water driving. The invention puts forward a method for making a core by rapid micro wave gluing of epoxy resin; with the microwave gradation effect, the aging phenomenon of the epoxy resin is avoided and the time and cost are saved. With consideration of the high-voltage driving mode like gas driving, pouring is carried out by using carbon fiber epoxy resin and the bearing strength of the core is better than that of the core poured by the common epoxy resin by over 1.8 times.