The invention relates to a steel tempering process, in particular to a quick normalizing heat treatment method for Q345R steel, which comprises the following steps of: heating: making a steel plate enter a furnace with the temperature of 750 DEG C from a room temperature state, calculating the heating time according to unit thickness temperature equilibrium time of 0.8-1.1 min/mm, and segmentallyheating to the target temperature of 910 DEG C, or uniformly setting temperature control areas of a scale-free roller-type heat treating furnace as 910 DEG C and making the steel plate directly enters the furnace with the temperature of 910 DEG C; keeping the temperature: after the steel plate is heated to 910 DEG C, and calculating the holding time according to unit thickness temperature equilibrium time of 0.8-0.9 min/mm for keeping the temperature; and cooling: cooling to room temperature. On the premise of ensuring that various properties meet requirements, the heating time and the holding time are shortened, the heat treatment capacity is improved, and problems that normalizing warmup time is too long so as to make various mechanical properties of steel meet requirements and ferrite-pearlite zonal textures refined, the capacity is lower and the like in the prior art are solved.