The invention discloses a steam soot blowing control method and system. The method comprises the steps that the water repellent temperature at the position of an outlet of a water repellent station is collected, and a soot blower is controlled to work according to the collected water repellent temperature and the temperature threshold value. According to the steam soot blowing control method and system, steam soot blowing with water and equipment damage caused by steam soot blowing with water can be avoided, the soot blowing effect and efficiency are improved, accordingly, a large amount of energy is saved, and meanwhile safety is improved.