This article studies the computer-aided realization of the online smart classroom of clothing design and its mobile software from the perspective of big data. The application of AR in the production of three-dimensional clothing models is described, the current situation of computer-aided design in clothing design is analyzed, and some application strategies are proposed. Promote the innovative development of the apparel design industry. Combining the background of big data, this paper proposes an innovative clothing design strategy based on AR three-dimensional model. Starting from the various elements of clothing design and discovering fashion elements from the perspective of data mining, it can achieve the purpose of clothing design innovation to meet the ever-changing social needs.