The invention relates to a webmax game engine and a method for developing a webgame by applying a webmax game engine. The webmax game engine comprises a game data downloader, a scene manger, a script system and a data communication module, wherein the scene manager is respectively connected with the game data downloader, the script system and the data communication module, and the data communication module is connected with the script system; the game data downloader is used for downloading and updating scene data and is in butt joint with the scene manager; the scene manager is used for managing the scene data, including adding, cloning and deleting operations of a scene model, and is in butt joint with the script system; the script system is used for logical operation of the game; and the data communication module is a data interaction module for an engine and a client. Compared with the prior art, the webmax game engine disclosed by the invention has the advantages of flexible and simple game engine, easiness in development and maintenance and the like.