VTI equivalent medium crack weakness parameter seismic inversion method and system

The invention discloses a VTI equivalent medium crack weakness parameter seismic inversion method and system. The method comprises the following steps: acquiring seismic data of a to-be-researched work area; acquiring an actual logging curve of the to-be-researched work area, wherein the actual logging curve is a logging curve of the elastic characteristic parameters and the fracture weakness; smoothing the actual logging curve of the to-be-researched work area to obtain an initial model of elastic parameter and crack weakness parameter inversion; according to the initial model of the elastic parameter and crack weakness parameter inversion, obtaining a to-be-estimated new attribute parameter by using a scattering theory and a weak anisotropy approximate hypothesis condition; and according to seismic data of a to-be-researched work area, based on a Bayesian inversion theory, performing seismic inversion on the to-be-estimated new attribute parameter to obtain an elastic modulus and a fracture parameter of the