The work aims to propose a novel evaluation method combined with the features of computational aesthetics to solve the problems of style, multidimensional indicators and method application in evaluation of physical interface aesthetics. By analyzing the current research status and gaps of interface aesthetics evaluation and computational aesthetics, an evaluation method of physical interface aesthetics based on computational aesthetics was put forward by Kansei engineering, factor analysis, planar coordinate positioning, aesthetic equation, etc. Differing from prior research, this method accounted for practical issues of perceptions of interface styles and multidimensional correlation indicators in user aesthetic elements, evaluation indicators, evaluation accuracy, and application validity and broadened the application of computational aesthetics from digital interfaces to physical interfaces. The interface design of a specific brand of oscilloscope was used as a case study for an empirical analysis of the novel evaluation method. The empirical results were validated by eye-tracking experiments, which demonstrated that the proposed method could accurately and effectively reflect users' aesthetic preferences. The formulated method and derived conclusions provide valuable guidance for the design and evaluation of physical interface aesthetics and serve as an instrumental reference for computer-aided interface design.