Fan control method, device and equipment for cooling fan

The invention discloses a fan control method and device for a cooling fan and equipment. The fan control method comprises the steps that current temperature measurement values of different temperature control objects on a mainboard of electronic equipment are periodically collected; the deviation of the temperature limit value of each temperature control object relative to the current temperature measurement value is determined, and the corrected deviation is obtained according to the deviation and parameters used for correcting the deviation; selecting the temperature control object with the minimum deviation after correction as a target temperature control object, and taking the deviation after correction of the target temperature control object as a target deviation En; according to the deviation interval where En is located and the temperature change parameter gamma n of the target temperature control object, a PWM pulse width adjusting strategy for controlling the rotating speed of the draught fan is det