An automatic monitor sliding system comprises a machine case, a slidable structure, a monitor mounting plate, and a monitor structure. The slidable structure is mounted inside a reception chamber of the machine case. The monitor mounting plate is mounted in front of the machine case. The monitor structure is mounted in front of the monitor mounting plate. As a result, the slidable structure slides the monitor structure forward to slant the monitor structure downward for facilitating the user to insert and retrieve the audio-visual disk. Consequently, the automatic monitor sliding system provides the functions of protecting machine, preventing dust, water permeation, and mistouch input, and providing high sliding radian.