The invention provides a developing nozzle structure and a method for spray coating developing solution. The developing nozzle structure comprises a nozzle cavity and a valve system, wherein, the nozzle cavity is provided with a first chamber, a second chamber which is positioned under the first chamber, an injection pipe which supplies the developing solution and injects the developing solution into the second chamber, and a spray coating pipe which is communicated with the second chamber and positioned under the second chamber; the valve system is arranged between the first chamber and the second chamber; when the valve system is opened, air bubbles in the developing solution enter into and concentrate in the first chamber; when the valve system is closed, the air bubbles in the first chamber are isolated from the developing solution in the second chamber, and the developing solution in the second chamber is sprayed out through the spray coating pipe. In this way, the air bubbles which are brought out to a panel along with the developing solution are greatly reduced, thereby the technological efficiency can be improved.