The invention discloses a data protection method of a
radio frequency smart card, and the method comprises the following steps of: receiving a write instruction through a
radio frequency module so as to obtain application identification codes; backing up the
raw data corresponding to the application identification codes in a data
storage area to a date
backup area, and setting and writing a start identification into an identification
storage area; writing new data into the data
storage area; setting a finish identification when the
wireless transaction is finished, and then writing the finish identification into the identification storage area; when the
radio frequency smart card is reset or electrified again, checking the identification storage area firstly so as to judge whether data exception occurs; if the judgment result is 'no', enabling the radio frequency
smart card to enter the normal working state; and if the judgment result is 'yes', writing the data in the data
backup area into the data storage area again. According to the data protection method of the radio frequency smart card, the data can be recovered when the write operation is interrupted accidentally during the
wireless card wiping process, so that the card wiping speed can not be influenced, and the use safety and reliability of the radio frequency smart card are improved.