The invention provides a thermal treatment technique of a thin format steel plate and is characterized in that a furnace cooling process is added between the heat preserving process and the air cooling process;parameter requirements of each process comprise: 1. a steel plate in a heat treatment furnace is heated to a temperature of Ac1-Ac3 in the heating process; 2. the holding temperature of the steel plate in the heat treatment furnace is Ac1-Ac3 and the heat-preserving time is 1H-3H in the heat preserving process; 3. the temperature of the steel plate at the furnace port is 350 DEG C - 650 DEG C in the furnace cooling process; 4. the steel plate took out from the furnace is cooled in the air to the room temperature.Comparing with a general technique of normalization and cold leveling, the technique of the invention has characteristics of low equipment investment, low energy-consumption, short line of production, low producing cost and better inside and outside quality of the steel plates.