The invention relates to an intelligent mist exhausting device used in a bathroom, and belongs to the field of household appliances. The intelligent mist exhausting device used in the bathroom is high in intelligent degree and comprises an exhaust fan installed in an exhaust duct of the bathroom and a speed-adjustable motor used for driving the exhaust fan to rotate. The intelligent mist exhausting device further comprises an oxygen concentration sensor, a microprocessor and a controller. The oxygen concentration sensor is installed inside the bathroom. Both the microprocessor and the controller are installed in the exhaust duct. The oxygen concentration sensor and the microprocessor are in communicating connection. The microprocessor and the controller are in communicating connection. The controller is electrically connected with the speed-adjustable motor. According to the intelligent mist exhausting device used in the bathroom, the oxygen concentration sensor is used for detecting the actual oxygen concentration inside the bathroom, and the controller controls the speed-adjustable motor to rotate at a set working speed according to the comparison result. The intelligent mist exhausting device is high in intelligent degree and capable of improving vapor dispersing efficiency.