The invention discloses a method and a device for preventing the unauthorized use of a fiscal card; after a user stamps a card on the card punching terminal of a financial system, the value of the distance between an intelligent mobile terminal device of the fiscal card owner and the current card punching terminal is obtained. The value of the distance can be determined through the positioning information about the intelligent mobile terminal device and information about the position of the current card punching terminal provided by a bank. The obtained distance value is then compared with apredefined distance value; if the value of the distance between the intelligent mobile terminal device and the current card punching terminal is smaller than the predefined distance value, then the financial system automatically performs a remit account, and the consumption transaction is succeeded; if the value of the distance between the intelligent mobile terminal device and the current card punching terminal is larger than the predefined distance value, then the issuing bank takes further measures after taking the advice from the fiscal card owner. The scheme of the invention further enhances the safety of using the fiscal card.