Slot milling machine

The utility model provides a slot milling machine which comprises a slot milling machine body, a machine frame arranged on the slot milling machine body, a driving device arranged on the machine frame and a clamp used for installing a workpiece, a slot milling cutter is installed on the driving device, and a chip groove is formed in the slot milling machine body and located below the clamp. A chip removal opening communicated with the chip removal groove is formed in the rear end of the slot milling machine body, a waste box is arranged at the position, below the chip removal opening, of the rear side of the slot milling machine body, a chip inlet corresponding to the waste box is formed in the side, facing the chip removal opening, of the waste box, and a protruding block arranged in the width direction of the waste box is arranged in the waste box; an insertion port is formed in one side of the waste box, a filter box inserted through the insertion port is arranged in the waste box, a plurality of filter ho