Milling cutter and use method thereof

The invention discloses a milling cutter and a using method thereof.The milling cutter is provided with at least one cutting edge and at least one chip groove which are spirally distributed along the peripheral face of a cutter body, each cutting edge is provided with a first main cutting edge and a second main cutting edge, and each chip groove comprises a first chip removal part and a second chip removal part; and the cutting directions of the first main cutting edge and the second main cutting edge are opposite. When the milling cutter works, the main shaft firstly rotates according to the first direction, at the moment, the first main cutting edge works, cut materials are discharged from the first chip removal part, and when the first main cutting edge is abraded to a certain degree, the rotating direction of the main shaft is converted, the second main cutting edge is switched to work, and the cut materials are discharged from the second chip removal part; and the chip discharging directions of the first