The invention relates to a coal carbonizing process parameter controlling system which is used for a coal carbonizing device provided with a coal gas, air and recycle gas transporting pipe. The system comprises a heat carrier temperature controlling part and a material final temperature controlling par. The heat carrier temperature controlling part controls the temperature of a heat carrier through distributing the high-temperature flue gas and the recycle gas into a mixing chamber at the same time, wherein the high-temperature flue gas is generated from the combustion of the coal gas and the air, and the recycle gas is generated from the heat exchange and is the flue gas when being used for drying the coal and is the raw coal gas when being used for carbonizing the coal. The mixing chamber is internally provided with a temperature sensor which is used for supplying the feedback signal. The flow rate of the recycle gas can be increased due to the high temperature of the mixing chamber and can be decreased due to the low temperature of the mixing chamber. The coal carbonizing process parameter controlling system can be operated conveniently and flexibly and controlled automatically and can quickly adapt to the change of the temperature.