The invention discloses a volatile organic compound treating method and device. The volatile organic compound treating method comprises the steps of: sensing a dew point temperature, namely sensing the dew point temperature of the atmosphere as a reference temperature; moisturizing and condensing, namely, spraying water mist to ensure that waste gas flow is moisturized and condensed to generate condensation water containing volatile organic compounds; sensing a dew point temperature after condensing, namely, sensing a temperature of the condensed waste gas flow; collecting liquid drops, namely, collecting the liquid drops dropping in the moisturizing and condensing step, and recycling and spraying the collected liquid drops to moisturize and condense; controlling, namely, controlling the temperature of the condensed waste gas flow to be close to the reference temperature. The volatile organic compound treating method and device has the advantages that no waste water is generated and the recycling concentration of the volatile organic compounds is increased so that the volatile organic compounds are recycled, and also has the effect of washing particulate matters.