The invention provides a full-automatic ultrasonic lint humidification system, which consists of a frame, a humidifier, a mist exhaust fan, a mist outlet pipeline, an atomization area, a water tank and an electric control part, and is characterized in that: three layers of atomization area are arranged; an overflow pipe is arranged on the outer edge of each layer of atomization pot; a water measuring probe is arranged on a lower-layer overflow pipe; a water level probe, a heating pipe and a temperature sensor are arranged in the water tank; and the electric control part consists of a power circuit, a singlechip circuit, a control display circuit, a detection circuit for water level in the water tank, water temperature in the water tank, moisture regain of seed cotton, the number of cotton ginning machine benches, atomization pot overflow water, and total current for humidification, and a control circuit for a water inlet solenoid valve, atomized water heating, an electric pump for supplying atomized water, the mist exhaust fan, alarm and an ultrasonic atomization module. After the system is powered up, main technical parameters for system operation are detected by detection circuits, and are analyzed and processed by the singlechip, and a corresponding electric control part is started to work to control the system to normally operate. The system has the advantages of high automation degree, low energy consumption and uniform humidification.