The invention discloses a coal carbonization and catalytic cracking combined technological method. feed coal is crushed and sieved, and then enters a preheating dryer, feed coal is dried and dewatered by catalytic cracking second regenerator flue gas and then enters a fluidized bed carbonization reactor, a mixture of catalytic cracking second regenerator flue gas burning produced high temperature flue gas, water and heated cyclic coal gas is taken as a heat carrier, under the conditions of 0.1-0.4MPa (absolute) and 500-750DEG C, pyrolytic reaction is carried out to generate coal gas, tar and semicoke. After gasification, the volume content of added water in the heat carrier is 1-20v%, preferably 3-10v%. The method organically combines coal chemical industry with petroleum refining technology, not only increases the tar yield, improves the calorific value of coal gas, but also realizes high efficiency cascaded utilization of energy.