The disclosure provides a printer and a control method thereof. The control method of the printer comprises: detecting the state of the printer; and when the printer is in error state, saving printing data and error information of the printer. The disclosure is hereby able to provide a basis for judging whether the printing is normal when printing fails due to a printing error during the printing process. The printer comprises a printing mechanism, a controller, a detection mechanism, a first memory and a second memory, wherein the detection mechanism is configured to detect the state of the printer and to obtain error information when the printer is in error state; the first memory is configured to temporarily store the printing data of the printer; and the second memory is configured to store the error information and the printing data when the printer is in error state.

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