With the development of computer network technology and database technology, the ecommerce industry has also experienced rapid growth, generating massive amounts of transaction data every day. Web data mining technology based on BP neural network algorithm can achieve targeted collection, organization, and analysis of this data, mining novel information with potential application value for merchants from a large amount of random and noisy data, which can serve as a powerful reference for business decisionmaking, improve customer satisfaction, reduce customer churn, and explore potential customer resources.