The invention discloses a shale fracturing self-supporting fracture network permeability calculation method. The method comprises: collecting basic data; Establishing a fracture width change equationunder shale self-supporting fracture stress sensitivity; Establishing a shale reservoir micro-nano size limited space gas effective viscosity calculation model considering shale self-supporting crackwidth dynamic change under stress sensitivity; Establishing a flow equation corresponding to the continuous flow, the Knudsen flow and the surface diffusion effect under the condition of considering the shale self-supporting crack width dynamic change and the reservoir gas viscosity change; Establishing a total flow calculation equation; And establishing a shale self-supporting fracture network permeability calculation model. According to the method, the micro-nano scale of the shear self-supporting crack of the shale reservoir and the mechanical property characteristics of the shale are considered; , the shale gas has the characteristics of viscous flow, slip effect, Knudsen diffusion, desorption and flowing of cracks of various scales in the shale micro-crack at the same time, and the comprehensive influence of factors such as effective viscosity change of the gas in the micro-nano size limited micro-crack space is avoided.