Based on the principle of electrowetting liquid lenses, an aspherical double-liquid lens model with a square cavity structure is designed using the COMSOL simulation software, and the accuracy of the MATLAB tool for fitting the interfacial shape of the model is analyzed. The specific device structure is designed and processed, and the surface change of the aspheric double-liquid lens is investigated. The experimental results of the aspheric surface are obtained via image processing and surface fitting analysis, thus verifying the feasibility of the aspheric liquid lens with a square cavity structure.