The article aims to identify the strategic principles for forming a marketing product innovation policy of an enterprise in the online trading system, taking into account the influence of the digital environment, data on consumer behavior, requirements for service, logistics, and reputation. The object is the process of forming and implementing a marketing product innovation policy of enterprises that sell in the Internet trade system. The relevance of our topic is due to the fact that Internet trade has transformed a product from a simple unit of assortment into a dynamic value proposition that is constantly changing under the influence of consumer behavior, platform algorithms, the speed of logistics and communications in the digital environment, as well as the growth of competition, where the comparison of prices and characteristics occurs instantly. In such conditions, companies cannot limit themselves to tactical decisions such as expanding the line or short-term discounts, since the strategic management of product innovation, its uniqueness, functionality, design, service component, environmental friendliness, safety and compliance with the expectations of specific segments that are formed and change faster than in traditional trade becomes crucial. The need to integrate product policy with demand data, reviews, behavioral signals, reputation management and the quality of customer experience, including information transparency, ease of returns, warranty obligations and after-sales support, becomes even more important, because in online trade these factors often determine repeat purchases and brand trust. The article explores the strategic principles of the formation of marketing product innovation policy in the online trading system and shows its role as the core of the enterprise's competitive strategy in the digital environment, where the consumer makes decisions quickly, has access to an array of alternatives and public reviews, and the quality of service becomes an integral part of the value. It is determined that the product in the online channel exists simultaneously as a material or digital product and as an information offer, which is perceived through the structure of the assortment, page content, comparison of characteristics, rating, availability, delivery terms, warranty obligations and return procedures, therefore, innovation should cover the product, service, information support and customer experience. The levels of innovation in online trading are characterized, in particular, updating functional properties, design, packaging and packaging, expanding the service component through support, exchange and loyalty programs, improving information transparency using high-quality descriptions, visual materials and answers to questions, as well as building convenient purchase and return scenarios.