A control apparatus of a hybrid vehicle which, when a travel mode is switched from an EV mode (second mode) to a series mode (first mode), can warm an exhaust purification catalyst appropriately to suppress deterioration of an exhaust gas, is provided, and configured as follows: If the temperature of the exhaust purification catalyst is equal to or higher than a predetermined temperature, the first mode (series mode) is selected when a required output is equal to or higher than a first determination threshold value; or the second mode (EV mode) is selected when the required output is lower than the first determination threshold value. If the temperature of the exhaust purification catalyst is lower than the predetermined temperature, the first mode is selected when the required output is equal to or higher than the first determination threshold value; the second mode is selected when the required output is equal to or lower than a second determination threshold value; or a specific mode (warm-up mode) is selected when the required output is lower than the first determination threshold value and higher than the second determination threshold value.