The invention discloses a method and a system for centralized early warning and monitoring of a data center computer room. The method collects the power, environment, security and host running monitoring quantities of the computer room, and converges them to the upper platform for monitoring and early warning. A system functional architecture is divided into: data awareness layer, convergence layer, analysis layer and service layer. Hardware for field equipment, local management station, superior management center are provided. Software for the server software, client software, WEB remote browser. In the monitoring, the electric quantity meter, water leakage detector, temperature and humidity sensor, optical fiber sensor and so on collect the data; The data are transmitted to the collectorthrough RS232 and RS485. The collector uploads the aggregated data to the local monitoring server. The local monitoring server stores the monitoring data uniformly, and analyzes the monitoring results and alarms the abnormal information. The local monitoring server uploads the monitoring results to the superior monitoring server, and the superior monitoring server aggregates the data results of multiple computer rooms, and carries out remote browsing and management at the same time.