The invention discloses a method for coproducing directly reduced iron in the process of coke dry quenching by coke oven gas. The method comprises the following steps of: introducing the coke oven gas or excessive purge gas obtained after methanol is prepared from the coke oven gas, which replaces nitrogen to serve as a heat transfer medium for cooling red coke, into a coke drying quenching oven;absorbing sensible heat of the red coke in the process of cooling the red coke, heating to the temperature of between 650 and 960DEG C, and discharging the gas serving as a hydrogen-rich reducing gasout of the coke drying quenching oven; heating the hydrogen-rich reducing gas to the temperature of between 1,000 and 1,150DEG C by supplying oxygen to provide heat for directly reducing iron from iron ore-coal pellets; and supplying coke oven gas by using furnace top gas produced in the process of directly reducing the iron, or balancing a carbon hydrogen rate by using a carbon element in the excessive purge gas obtained after methanol is prepared from the coke oven gas.