The utility model discloses a rotor for three -phase asynchronous motor's self -starting permanent magnet synchronous motor, including rotor core, pivot, cage strip and end links, the cage strip is the just radial equipartition of bar in the rotor core outer fringe, the both ends of cage strip are connected with two end links respectively, and the cross -section matches for curved groove with the cross -section of equipartition on rotor core is global respectively for curved permanent magnet, and the sheath cover is established the rotor core outer peripheral face with on the outer peripheral face of permanent magnet, the sheath is made for electrically conductive not magnetic?materials, the lower terminal surface and the contact of cage strip of permanent magnet. The sheath is the stainless steel lantern ring. The utility model has the advantages of the efficient and with low costs is showing.