The invention is suitable for the technical field of printing, and provides a printing method and printing device for a mobile payment terminal. The printing method comprises the steps of obtaining to-be-printed information through a preset printing application program; transforming the to-be-printed information into a binary picture data; and printing a slip including the to-be-printed information according to the binary picture data. According to the printing method and the printing device, an information printing function is completed through transforming the to-be-printed information into the binary picture data according to the binary picture data. Compared with the prior art, the printing device has the advantages that a specific character-encoded character dot matrix does not need to be obtained from a character library due to the fact that the printing device for the mobile payment terminal can directly identify binary picture data-based machine language information, arrangement of a character library IC can be omitted, and the problem that printing of information which is encoded by a character encoding mode which is not supported by the character library cannot be correctly completed is solved, thereby further expanding the application scene of the mobile payment terminal.