The invention discloses a coking delaying method. The method is characterized in that: an easily coked raw material is heated to 450-520DEG C, a hard coked raw material is heated to 500-580DEG C, the two raw materials are mixed to obtain a mixture, the mixture enters a coke tower from the lower part of the coke tower, cracked products enter a fractionation system, and coke stays in the coke tower. So the liquid yield is improved by 0.79%, and the coke yield is reduced by 1.38%.