Multiunit server fan monitoring system

The invention belongs to the technical field of monitoring and provides a multiunit server fan monitoring system which comprises a hardware portion and a software portion. The hardware portion comprises a server mainboard, a management board, a baseboard, a power source, a fan, a temperature sensor MAX6639, a BMC chip and a PWM (pulse-width modulation) four-blade fan, and the software portion comprises a BMC software system, a fan rotating speed judging system and a fan rotating speed control system. The multiunit server fan monitoring system solves the technical problem of monitoring of an operating environment of a multiunit server and realizes monitoring and controlling of a multiunit server fan radiating system.