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This invention belongs to the field of shale oil development, specifically relating to a method for optimizing the optimal development layer system for lamellar shale oil. It aims to solve the problem that existing technologies cannot accurately locate the optimal development layer system, thereby maximizing resource utilization. The method includes: determining the daily oil production per 100 meters of different sections in key wells within a lamellar shale oil reservoir study area for which the optimal development layer system is to be selected; constructing a standard well economic chart to determine the production limit per 100 meters; constructing well logging evaluation charts and well logging evaluation charts; selecting the optimal development layer and corresponding optimal target box for each section using the well logging evaluation charts and well logging evaluation charts; determining the average fracture height under the current fracturing scale; and merging the selected optimal development layers based on the average fracture height and optimal target box to obtain the final optimal development layer system. This invention, by comprehensively considering factors such as production, fracturing scale, and fracture height, helps developers more accurately locate the optimal development layer system, thereby effectively improving resource utilization.