The invention provides a password input method and a mobile terminal. The method comprises the steps of: when detecting an input focus point in a password input box of a currently running application program, judging whether the application program has a preset keyboard; if the application program does not have a preset keyboard, displaying a system preset keyboard with key values of keys being subjected to random distribution treatment; detecting key values selected by a user on the system preset keyboard and inputting the selected key values into the password input box. The method judges whether an application program requiring password input has a preset keyboard and displays a system preset keyboard with key values of keys being subjected to random distribution treatment for password input when determining that the application program does not has a self-developed password-protecting preset keyboard, so that even if the protection for input passwords of individual application programs is weak, the safety of input passwords can be guaranteed via the system preset keyboard provided by the embodiments of the invention, so that safety protection can be provided for input passwords for all application programs installed in a mobile terminal.