Remote information input method, device and system are disclosed. The method includes: receiving a screen snapshot of a terminal device and sending the screen snapshot to a remote input device; receiving a keyboard input instruction from the remote input device, the keyboard input instruction including an identification of the terminal device and a keyboard code; determining a corresponding target key in the terminal device based on the keyboard code and a key code mapping table; identifying the screen snapshot of the terminal device and determining whether the target key exists in the screen snapshot; acquiring a coordinate of the target key in a screen snapshot in response to determining that the target key exists in the screen snapshot; and sending a click instruction to the terminal device, according to the coordinate of the target key in the screen snapshot and the identification of the terminal device.