The invention discloses an advantage seepage channel determining method and device and a storage medium, and belongs to the technical field of oil field development. The method comprises the steps ofobtaining a target seepage rate, the oil saturation and target oil deposit index parameters of a target oil layer; when it is determined that an advantage seepage channel exists at the target oil layer according to the target seepage rate, the oil saturation and the target oil deposit index parameters, it is determined that the advantage seepage channel exists in the oil deposit, wherein the target seepage rate is a current seepage rate, and the target oil deposit index parameters are water absorption ratios, or the target seepage rate is an original seepage rate, and the target oil deposit index parameters include the seepage rate variation quantity and cross-well water through multiples and water injection efficiency of a target communication well group. By combining oil deposit dynamicand static production parameters and original oil deposit attributes and current oil deposit attributes, beginning from comprehensive assessment of various influence factors, it is determined that theoil deposit has the advantage seepage channel, the advantage seepage channel determination accuracy is improved, and the oil field development cost is lowered.