The utility model discloses a conversion method of page description information and a device of an application page description. The method comprises the following steps: in the current page description information, the current state congregation is updated through an ergodic state instruction and an object instruction, and a new object instruction is generated; a page description information with the state can be conversed into the page description information comprising the object instruction, and the complete page information of any one or a plurality of object instructions can be acquired by utilizing the generated page description information after conversing without the ergodic state instruction; furthermore, the state instruction and a new object instruction are generated through an ergodic object instruction, and a page description information without the state can also be conversed into a page description information with the state which is used widely at the moment, thereby saving storage space.