The invention relates to the technical field of information security, and particularly to a password input system and a password input method for a self-service terminal, which are capable of preventing peep and theft efficiently. The password input system comprises a keyboard at least including 14 key particles, the layout of which can uniquely determine a positive use direction of the keyboard; a random key value distribution unit used for carrying out random distribution for key values corresponding to ten key particles from 0 to 9 of the key particles; and a keyboard layout reminding unit used for outputting the keyboard layout to a password inputting person to enable the password inputting person to know the specific key value layout of the key particles during the inputting after the keyboard layout randomly distributed by the random key value distribution unit is printed. In order to obtain the input password value of a user, the password information of the user cannot be derived unless a printing paper of the keyboard layout, a corresponding relationship table of the key particles and the digits and a key sequence of the user are obtained at the same time. According to the scheme of the invention, the security of password input at the self-service terminal is improved greatly.