A method for optimizing the cluster spacing of a horizontal well for shale gas fracturing, belonging to the technical field of petroleum exploitation. Said method comprises: first, establishing an induced stress field distribution model for a single fracture, then establishing an induced stress distribution model for segmented single-cluster fracturing of a horizontal well, then establishing an induced stress distribution model for segmented multi-cluster fracturing of a horizontal well, and finally optimizing the fracturing parameters and the fracture spacing according to a distribution rule of induced stress differences. On the basis of a segmented multi-cluster fracturing induced stress calculation model which considers the stress barrier and stress interference effects and effective net pressure change when a plurality of fractures are extended simultaneously, the optimization method is more suitable for the features of the actual working condition, has high precision, and is able to provide more accurate theoretical guidance for the optimization design of the segmented multi-cluster fracturing of the horizontal well.
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