Screen locking method of digital television receiving terminal and screen locking system

The invention provides a screen locking method of a digital television receiving terminal and a screen locking system. The method comprises the following steps that: a screen locking arrangement request of a digital television receiving terminal is received, wherein the screen locking arrangement request contains screen locking time; and it is determined whether the screen locking time is reached or not; if so, a screen locking page is sent to the digital television receiving terminal and a response message feedbacked by the digital television receiving terminal is received; and the response messages determines whether the locked screen is unlocked; if so, a screen locking page cancelling indication is sent to the digital television receiving terminal. According to a technical scheme provided in the invention, screen locking processing on a digital television receiving terminal can be realized.