This paper aims to propose a product innovation design method based on parametric thought. Aiming at the conceptual design stage of products, parametric thought design methods are used to create a design environment that inspires designers to carry out better product innovation designs. According to design requirements, perform functional feature description and analysis of the product, initially determine the position, structure, size and other design parameters of each functional component, then logically deduct the modeling generation, and select the algorithm in the parametric design platform composed of Rhinoceros and Grasshopper. Then generate the shape of the product, and finally determine the innovative design plan through the analysis, evaluation and parameter adjustment of the whole plan. Product innovation design methods based on parametric thought can effectively help designers to diverge their thought. The design scheme has a high degree of optimization, strong feasibility, and wide expansion space, which meets the needs of theory and practice. In the field of industrial design, product innovation design methods based on parametric thought, proved to be effective, can make up for the shortcomings of traditional design methods and make product design more efficient and innovative.