The invention relates to an ethylene cracking furnace charring process control method. A detection system detects working condition parameters of the charring process, and the detected working condition parameters are sent to a DCS control system; and the DCS control system compares the monitored CO/CO2/O2 content change and the furnace tube temperature with a set threshold, and adjusts the air/water vapor flow rate and the furnace temperature according to the comparison results. The method has the advantage of optimizing the charring effect.