The invention provides a rapid water feeding stabilization control method based on a boiler water circulation online monitoring system. The method is characterized by including boiler water circulation online monitoring device arrangement, data acquisition, FCB historical extraction, data arrangement, washing, water-circulation water feeding strategy fitting, data extraction and monitoring and the like. Automation is realized, the FCB process is guaranteed being safe and reliable, boiler water feeding amount is controlled scientifically and reasonably, and safe production is guaranteed.