A remote machining optimization system for a machine tool is provided, which includes an input unit configured to input a machining parameter including a spindle speed and a cut depth; a receiving unit configured to receive sound signals and vibration signals from the machine tool; a processing unit configured to generate a machining program with a program generating module, to modify the spindle speed and the cut depth according to the sound signals with a speed optimization module and a depth optimization module, respectively; a communication unit configured to send the machining program to the machine tool; and a storage unit configured to store the modified spindle speed and the cut depth.