Spindle box of numerical control machine tool

The utility model relates to the technical field of numerical control machine tools, and discloses a numerical control machine tool spindle box which comprises a spindle box body and further comprises a cleaning mechanism, a dust collecting mechanism and a heat dissipation mechanism, the side face of the cleaning mechanism is fixedly connected with the interior of the side face of the spindle box body, and the bottom end of the dust collecting mechanism is fixedly connected with the top end of the spindle box body; the cooling fans are driven by the motors on the two sides to rotate, meanwhile, the rotation directions of the motors on the two sides are different, so that cold air on the outer side of the box body enters the box body after being filtered by the filter screen on one side, hot air is discharged from the filter screen on the other side, and heat dissipation is conducted on the box body; the push rod moves in the movable groove and pushes the movable rod to reciprocate along the sliding rail, the