The invention discloses a 
stain removal device of a part 
machining machine tool. The 
stain removal device of the part 
machining machine tool comprises a mounting box and is simple in structure. A lacked gear is driven to rotate through a first motor and engaged with a first rack, under the effect of a first spring, a sliding rod drives a full gear to move horizontally in a reciprocating mode, thusthe full gear rotates horizontally in a reciprocating mode along a second rack, and then two brushes rotate horizontally in a reciprocating mode to clean oil stains on the 
machine tool. Then a 
transmission belt is driven to rotate through a second motor, a linear-shaped 
magnet intermittently rejects a T-shaped 
magnet in the 
transmission belt moving process, under the effect of a second spring, apull 
rope and a third spring, the two brushes both conduct reciprocating deflection to improve the cleaning efficiency, and the oil removal capacity is reinforced. The linear-shaped 
magnet intermittently downwards pushes a movable rod, under the effect of a fourth spring and a connecting rod, two 
piston rods move in a back-to-back or head-to-head mode, and washing liquid in a sleeve is squeezed out by pistons through a spraying 
pipe.