The invention provides an IoT-based intelligent building management system, which comprises an application layer, an automation layer, a virtualization layer, a physical layer, a safety and credit management layer and a configuration management layer, wherein the automation layer is used for automatically operating and executing a command and an event by adopting a machine learning mechanism according to a user activity; the virtualization layer comprises a virtual equipment management module; the physical layer comprises equipment; the safety and credit management layer comprises a service management module, a context management module, a communication management module and a safety and credit management module; and the configuration management layer comprises a service quality management module and a layout management module. The system provided by the invention is capable of reliably transmitting measurement data of the sensor in real time; a false alarm is avoided through calculating a credit value of the data; the condition that a hostile attack or an equipment failure affecting system decision does not exist in the system is ensured; and advanced intelligence of the system is achieved through a functional component of the automation layer in a system architecture.