The invention belongs to the field of oil and gas exploitation geology, and relates to a method of geological modeling of a reservoir architecture of a point bar of a meandering river under a development well pattern. The method comprises the following specific steps: carrying out single-well reservoir architecture interface dividing inside single sand layers; producing well-connected backbone profiles, and carrying comparison and combination of lateral lamination inside the point bar; calculating a lateral accretion interlayer dip angle of a lateral accretion body of each stage on the backbone comparison profiles; utilizing a core and a logging curve to determine the lateral accretion interlayer thickness of each stage; utilizing well point stratification data to establish structure bedding surfaces of the single sand layers; simulating lateral accretion interlayer top-surfaces and bottom-surfaces of the lateral accretion bodies of the point bar stage by stage in a structure model of the single sand layers to obtain a bedding surface model of lateral accretion interlayers; and utilizing the bedding surface model of the lateral accretion interlayers inside the point bar to generate a geological model of the lateral accretion bodies and the lateral accretion interlayers inside the single point bar. According to the reservoir architecture model, established by utilizing the method of the invention, of the single point bar of the meandering river, the lateral accretion interlayer does not disappear due to the thin thickness when roughening processing is carried out, a structure inside the point bar can be accurately reflected, and the need of numerical simulation of fine oil reservoirs can be met.