The invention relates to a production method of tempered glass, which comprises the following steps: putting glass to be treated in a 180-220 DEG C preheating furnace, heating to 280-320 DEG C within 50-70 minutes, heating to 370-390 DEG C within 20-40 minutes, and heating to 400-420 DEG C within 50-70 minutes; transferring the glass subjected to pre-heat treatment into a 400-420 DEG C tempering furnace, and carrying out tempering treatment for 3-5 hours to obtain glass subjected to tempering treatment; and finally, transferring the glass subjected to tempering treatment into a 400-420 DEG C annealing furnace, cooling to 90-100 DEG C within 150-210 minutes to perform annealing treatment, and cooling to room temperature to obtain the tempered glass. Compared with the traditional production process, the method performs three-stage pre-heat treatment on the glass to be treated so as to gradually enhance the temperature, thereby avoiding warping of the tempered glass due to instantaneous occurrence of large temperature difference since the transition temperature difference among the preheating, tempering and annealing is small; and the method avoids edge breaking due to excess thermal expansion and cold shrinkage, can lower the edge breaking fraction defective by 1-2%, and lowers the warping degree by 0.05-0.3mm.