The mounting structure for a display screen includes a cabinet for fixing the display screen. The cabinet includes an outer frame that is connected to an external fixed structure and a panel that is detachably connected to the outer frame. The outer frame is fixedly connected to the panel through a lock mechanism in a locked state and is separated from the panel when the lock mechanism is opened. The cabinet is divided into the separate panel and the outer frame, and the outer frame that is lighter in weight is installed at first and then the panel is detachably connected to the outer frame by the lock mechanism.