The present invention provides a method for simulating flow conductivity of shale gas reservoir fractures. The method comprises the following steps of: producing a shale rock plate, splitting the shale rock plate into two rock plate portions, and arranging the two rock plate portions into a device for testing flow conductivity of fractures for test. Due to the fact that the two rock plate portions are formed by splitting the shale rock plate, the fractures formed by the two rock plate portions can be used for simulating the flow conductivity of shearing fractures of the shale, so that the device can be used for simulating flow conductivity of stimulated reservoir volume fracturing fractures and flow conductivity of shearing fracturing fractures.