Device and method for cleaning printing nozzle through air compression

The invention provides a device and method for cleaning a printing nozzle through air compression. The device comprises a transfer container, a cleaning liquid branch, a gas branch and an atmosphere branch. The transfer container is provided with a liquid inlet, a gas inlet and a main outlet, the main outlet is connected with the nozzle through a main outlet pipeline, and the main outlet pipeline is provided with a first control valve. The cleaning liquid branch comprises a liquid conveying device, and the liquid conveying device communicates with the liquid inlet of the transfer container through a liquid pipeline and injects cleaning liquid into the transfer container. The gas branch comprises a gas conveying device, and the gas conveying device communicates with the gas inlet of the transfer container through a gas pipeline and introduces gas into the transfer container. The atmosphere branch comprises an atmosphere pipeline for communicating the outside atmosphere with the interior of the transfer contain