The invention discloses a spray head and a spraying method based on the spray head. The spray head comprises a liquid storage cavity, a bubble generator, a main nozzle and a high-pressure pipeline, the liquid storage cavity is used for storing raw liquid materials, the high-pressure pipeline is used for conveying high-pressure gas, the bubble generator is used for generating small bubbles through the high-pressure gas and injecting the small bubbles into the raw liquid materials to be sprayed in the main nozzle, the main nozzle is connected with the liquid storage cavity and used for spraying the raw liquid materials wrapped by the small bubbles out in a liquid drip mode. An existing spray head structure is changed, the small bubbles with high pressure are injected to the main nozzle, when the raw liquid materials are sprayed out from the main nozzle, liquid drips wrapped by the small bubbles drop on a substrate, the small bubbles explode slightly, the liquid drips are fully scattered within a short period, and finally an even liquid film layer is formed on the substrate, so that the problem of uneven thickness of the film layer is avoided, and the product reject ratio is greatly lowered.