The invention provides a commodity association degree determination method and device, and relates to the technical field of electronic commerce. The method comprises the following steps: according tothe category purchase data and the user non-purchase behavior data, obtaining an association relationship corresponding to a category purchase behavior of the purchase target category and a user non-purchase behavior and a category purchase behavior of other commodity purchase categories; and based on the association relationship and the weights corresponding to the category purchasing behaviorsand the user non-purchasing behaviors, determining the association degree between the commodity purchasing categories, and selecting the associated categories according to the association degree. According to the method and the device, user behavior data of browsing, shopping cart adding, attention, purchasing and the like are comprehensively analyzed. The product association degree is calculatedthrough the quantifiable association coefficient, the storage space can be saved, the calculation speed can be ensured, the method can be applied to different commercial marketing scenes, accurate product positioning analysis can be met, marketing activities with high recall rate can be met, and the use experience of users can be improved.