The invention provides an irregular oil-water interface modeling implementation method. The method comprises the following steps: preliminarily simulating the space distribution of an oil-water interface of an oil-containing area; determining the fluctuation range of the oil-water interface according to the deepest and shallowest oil-water interface depths meeting during single-well drilling, and constraining the result of the last step by taking the oil-water interface fluctuation range as constrained control; determining a water-top interface of a pure water area according to the top surface structure of water sand; merging the oil-water interface of the oil-containing area and the interface of the pure water area to finally obtain an irregular oil-water interface of the whole area. According to the irregular oil-water interface modeling implementation method, the maximum coincidence between the oil-water interface of a well point and actual drilling is realized, the phenomenon that water exists in oil and oil exists in water appears on a single well when a unified oil-water interface is adopted is avoided; in addition, the irregular oil-water interface modeling implementation method is clear in technical concept and simple to operate, breaks through a method of a previous single oil-water interface and solves the problem that the irregular oil-water interface is not easily realized in a model.