The invention provides a multifunctional numerical control machine tool convenient to maintain. The machine tool comprises an observing window, a fixed frame, a protection cover, flow guide plates, anumerical control machine tool body, a chip removal pipe, an auxiliary lifting handle, supporting legs, a supporting foot base, a triangular frame, a numerical control screen, an adjustable type numerical control program input prompt display board structure, a machine tool machining chip solid-liquid separation collection box structure, a lifting type operation pedal structure and an observing convenient-maintaining opening and closing cleaning plate structure, an observing window is embedded in the fixed frame, the fixed frame is embedded in the middle of the inner side of the front portion of the protection cover, the left end and the right end of the lower side in the protection cover are in screw connection with the flow guide plates, through arranging of an alligator clip, a numericalcontrol program input display board structure, a rotating rod, a through hole, a movable adjusting rod, an opening ring, a movable bolt, a U lining base and a rotating shaft, the program input auxiliary display function can be added, and turning errors caused by mis-input can be avoided.