The invention discloses a printing method. The printing method is used for printing on a piece of non-standard size paper under settings of a standard size paper type, and comprises the steps of: generating a first print image after receiving a printing instruction of a document in need of printing under the settings of the standard size paper type from a user; intercepting a minimum rectangular image area comprising document data in a same page from the first print image; generating a blank image of the standard size paper type corresponding to the first print image, and determining a paste area corresponding to an assigned printing area on the non-standard size paper on the blank image; pasting the minimum rectangular image area to the paste area on the blank image of the standard size paper type to generate a second print image of the standard size paper type; and printing the second print image on the non-standard size paper under the settings of the standard size paper type. The invention further discloses a printing device for executing the printing method.