The invention relates to a knowledge service method and system based on industrial service cloud platform user behavior perception. The method comprises the following steps: 1) uniformly describing knowledge resources in an industrial service cloud platform through an ontology, and eliminating the isomerism of different knowledge resources in structure and semantics; 2) obtaining personalized knowledge demands of the user according to business activities of the user in the industrial service cloud platform, and establishing a user personalized model according to the personalized knowledge demands of the user; and 3) on the basis of the established user personalized model, retrieving the knowledge resources of the industrial service cloud platform to obtain the knowledge resources meeting the personalized knowledge requirements of the user. According to the invention, personalized intelligent knowledge services of user behavior perception can be provided for various large, medium and small industrial manufacturing enterprises of the industrial internet, blindness of knowledge resource searching by a user can be greatly reduced, and required knowledge resources can be provided for the user quickly.