The invention relates to a plate-type ozone generator having an overheating protection device. The plate-type ozone generator comprises an ozone generator and a heat exchanger. The heat exchanger is provided with a temperature probe which is connected to a temperature controller through a signal line. The temperature controller is respectively connected to an ozone generator switch and an alarm circuit and controls actions of the ozone generator switch and the alarm circuit according to a preset value. The temperature controller, through control of closing of a relay for switching on a control signal, shuts down the ozone generator switch and meanwhile switches on the alarm for warning. By means of the temperature probe, the temperature controller and the alarm for forming the overheating protection device, the ozone generator can be protected by the overheating protection device timely so that reductions of yield and concentration of ozone are avoided and damage on the plate-type ozone generator is avoided. The plate-type ozone generator having the overheating protection device can achieve an energy-saving and synergistic effect in the fields of water treatment industry, desulfurization and denitrification and industrial oxidization and the like.