The invention discloses a delta sand body internal structure analysis method based on overlapped lobes. The method includes the following steps that firstly, data are collected; secondly, a top interface and a bottom interface of a layer are determined; thirdly, the interface characteristics of the lobes are determined by analyzing the lithological and electrical characteristics of lobe boundaries, and the lobe boundaries are determined; fourthly, reservoir internal structure characteristics are recognized through bottom leveling, and the mutual relation between the lobes is preliminarily analyzed; fifthly, based on recognition of the lobes, the lobes are divided into a composite lobe level and a single lobe level, the corresponding relation between the lobes is analyzed, the relation between the lobes is determined, comparison analysis is conducted on the distribution characteristics of the lobes on a section, and interwell distribution of the lobes is determined; sixthly, the plane distribution range and the distribution shape of the lobes are determined; seventhly, the reservoir structure is verified. By the adoption of the method, a delta sand body internal structure is accurately described, reliability and practicality are high, a new thought is provided for understanding of anisotropy of reservoirs, and the method can be widely applied to the technical field of exploitation and development of oil and gas.