Inverted numerically controlled machine

The utility model relates to an inverted numerically controlled machine tool which comprises a machine tool base seat (1), a main shaft support guide rail (2) and a knife rest fixing device guide rail (3) are arranged on the surface of the machine tool base seat (1) in parallel, a main shaft support (4) is installed on the main shaft support guide rail (2), and a knife rest fixing device (5) is installed on the knife rest fixing device guide rail (3). The inverted numerically controlled machine tool is characterized in that a main shaft guide rail (6) is arranged in the vertical direction of the main shaft support (4), a main shaft box (7) is installed on the main shaft guide rail (6), and a clamp (8) is installed at the downward end of the main shaft box (7). The clamp of the inverted numerically controlled machine tool is arranged above the knife, and the refuse cut down from the work piece can automatically fall down, thereby not influencing the subsequent cutting processing.