Dedicated instrument for cutting white hair

The invention relates to the technical field of the hairdressing, especially a dedicated instrument for cutting white hair. The instrument comprises a housing and a display lamp; a left end of the housing is fixedly connected with the display lamp, an inner side of the housing is fixedly connected with a hair cutting device; the hair cutting device comprises a first motor, a right end of the housing is fixedly connected with the first motor, the tail end of the spindle of the first motor is fixedly connected with a first screw, a lantern ring is arranged on the outer side of the first screw ina sleeving manner, a back end surface of the lantern ring is fixedly connected with a sliding plate, the top end of the lantern ring is fixedly connected with a second electric expansion link, the top end of the second electric expansion link is fixedly connected with a second motor, and the the tail end of the spindle of the second motor is fixedly connected with a haircut knife. By arranging the first screw, the lanter