The invention provides a method for delaying coking. The method comprises the following steps: 1) high temperature materials from a radiant section of a heating furnace enter a tower from positions above a foam layer of a coke tower, and a coking reaction is carried out in the coke tower; 2) when the coking reaction is carried out, steam stripping is carried out to the generated coke by continuously blowing a proper amount of high temperature steam to a bottom part of the coke tower; 3) pressure of 0.10Mpa-0.6Mpa on a top part of the coke tower is maintained, oil gas generated by the reaction is discharged from the top part of the coke tower to a fractionating tower. After carrying out the coking reaction for 0.5hr-12hr, the coke which is fully steam stripped starts to be automatically and continuously let out by a coke-discharged valve at the bottom of the tower, and the coke is discharged to a coke gathering tank or being carried way by a transmission band. With the method provided in the invention, a green coke period which can delay coking is shortened, utilization efficiency of the coke tower is improved and investment and processing energy consumption are reduced. Simultaneously, a hot and cold period circulation of the coke tower is avoided to increase a service life of the coke tower.