The invention discloses a modeling method for a sand shale interbed type sedimentary body reservoir architecture. The method comprises three aspects of hard data control, layered modeling, and reservoir and interlayer nesting, wherein the layered modeling mainly comprises reservoir modeling, spacing layer modeling, and interlayer modeling. According to the modeling method, thin layer division is performed by adopting a half amplitude point based thin layer division principle, so that the defect that true thicknesses and depths of a reservoir and a spacing layer cannot be obtained in a conventional method for determining a boundary line of a thin layer based on relative maximum of natural gamma and/or positive anomaly of natural potential is overcome; and the hard data control is adopted for architecture modeling, so that a demarcation point of sand shale is accurately positioned, three-dimensional spatial distribution of single sand bodies and sub sand bodies is accurately depicted, the architecture effect is good, the precision is high, the difficulty in development is lowered, and the development benefits are increased.