The invention relates to an intelligent inventory early warning and management system based on a BIM (Building Information Modeling) model. The method comprises the following steps: 1, a BIM model is imported to the system; 2, a cargo requirement task plan based on the BIM model is generated in the system, and the cargo requirement task plan is sent to a factory; 3, the BIM cargo requirement plan is subjected to model decomposition, and the material amount for needed component types is counted; 4, the system judges the current inventory; 5, the system judges an insufficient component material amount, if the cargo requirement plan time is smaller than needed time T, first-level inventory early warning is triggered, or otherwise, second-level inventory early warning is triggered; 6, coordinated purchasing is carried out on component list materials; and 7, the system detects whether the current inventory meets enterprise safety inventory. The informatization operation level of inventory management of a construction enterprise is enhanced.