The invention discloses a terrestrial facies shale gas fracture network fracture parameter optimizing method comprising the following steps: S1, based on a large size sample, using a hydraulic fracturing physics simulation test system to design an indoor shale gas hydraulic fracturing physics simulation test, and optimizing indoor shale gas hydraulic fracturing physics simulation test parameters; S2, according to the indoor shale gas hydraulic fracturing physics simulation test optimized test parameters, combining with target block field fracturing construction conditions, optimizing terrestrial facies shale gas hydraulic fracturing construction parameters, and making a terrestrial facies shale gas fracturing scheme; S3, analyzing the difference between field fracturing construction conditions and laboratory conditions, and applying the parameter optimized result in the field fracturing construction, thus obtaining a complex fracture network. The method combines parameter optimizing test under laboratory conditions with field construction parameter optimization, thus adding crack complex level in the terrestrial facies shale gas fracturing process, artificially increasing permeability, and obtaining a more complex fracture network closer to reality.