With the rapid development of the Internet and digital technology,e-commerce is increasingly becoming a dominant force in global commerce.In this context,visual marketing plays an increasingly critical role as an important marketing tool.This paper first gives an overview of the concept of visual marketing and its development history,focusing on the importance of visual design in brand marketing promotion.Then,by analyzing the shortcomings of e-commerce brand promotion in the context of big data,it focuses on how to optimize brand design and promotion strategies by using visual content design and data-driven methods.By analyzing user data to personalize the presentation of visual content,user experience can be improved,brand awareness and recognition can be enhanced,so as to achieve the effective promotion of e-commerce brand.The purpose of this paper is to discuss the importance and use of visual marketing design in the field of e-commerce,and to provide new ideas and methods for brand promotion by visual design in the context of big data.