Ozone generator; An ozone generator is provided to prevent damage of apparatus due to heat during high pressure corona discharging and resolve ozone elimination. In an existing ozone generator consisting of a corona discharging system in which the temperature is more than 40 DEG due to using high pressure and ozone is destroyed at the temperature, and the instrument is easily to damage due to one corona discharging tube continuously working at high pressure. According to the invention, the ozone generator is characterized in that a plural corona discharging systems are formed so that each of the corona discharging systems are alternately operated for a certain period of time by a switching unit