The present invention provides a numerical value simulation method for an adaptive medium of a natural fractured reservoir. The method comprises: determining a reservoir numerical value simulation research region according to research demands, and establishing a research region boundary track file; according to a geological condition, forming different-scale fracture information files; classifying fractures within a simulation region boundary range; classifying grid elements; based on the grid elements obtained in step3, establishing a reservoir numerical value simulation static model; acquiring a grid element attribute of each class of grids; and based on each grid element attribute, establishing a reservoir simulation model. The numerical value simulation method for the adaptive medium of the natural fractured reservoir more really reflects the actual geological condition, accurately describes a distribution feature of different levels of fractures and factures at different growth degrees inspace, and thus ensures reliability of a geological mode and accuracy of a reservoir numerical value simulation result to the largest extent.