The invention discloses a machine tool oil mist purifier which comprises a front air distribution device, an air inlet, a filtering box, a third filter, a silencer, a box and fixed support legs. An impeller is mounted on the left side of the front air distribution device, a second filter is connected with the inside of a first filter, an air outlet is formed in the left side of the filtering box, a collision filter is mounted in the air outlet and connected between the second filter and the first filter, an air outlet is formed in left side of the box, a rear end cover and a buckle are connected between the third filter and the box, the silencer is connected with the third filter, and the box is connected with the fixed support legs. According to the machine tool oil mist purifier, layer-by-layer secondary filter is achieved, production cost is saved, benefits are expanded, the silencer is arranged, working environments of workers are more comfortable, use ratio of a whole machine is high, and the machine tool oil mist purifier is reasonable and humanized in design and has high recycling benefits.