A method, device and system for preventing network bank from hijacking data

The invention provides a method, a device and a system for preventing data in an Internet bank from hijacking, the method comprises the steps of: receiving a bank service request and extracting the key service data in the bank service request; generating a random verification code for the key service data; generating a figure which displays the key service data and the random verification code; sending the figure to users and receiving the verification codes input by the users; judging whether the received verification code is as the same as the random verification code contained in the sent figure, if so, performing the sequent bank service processing, if not, terminating the bank service. The technical proposal of the invention adopts the figure technology to protect the important data information of users from juggling, enhancing the security of trade information at the client.