The invention discloses a surface type permanent-magnet synchronous direct-drive motor rotor which comprises a rotor shaft, a blind hole shaft, a front rotor wheel hub, a back rotor wheel hub and a cage-shaped permanent magnet mounting cylinder. The rotor is characterized in that the front rotor wheel hub and the back rotor wheel hub are fixedly sleeved at the front part and the back part of the rotor shaft respectively; the cage-shaped permanent magnet mounting cylinder is supported by the front rotor wheel hub and the back rotor wheel hub, and is integrated with the rotor shaft; a plurality of permanent magnet axial positioning grooves are distributed along the circumference of the cylinder body of the cage-shaped permanent magnet mounting cylinder at equal intervals; an irregularly shaped hole is axially formed between two adjacent permanent magnet axial positioning grooves; the end surface of the irregularly shaped hole is shaped like a bell mouth, and is formed in a position where flux linkage through the cage-shaped permanent magnet mounting cylinder is sparse flux linkage when the rotor is at maximum output; and a plurality of permanent magnets are fully distributed on the surface of the cage-shaped permanent magnet mounting cylinder, and each permanent magnet is positioned and fixed by one positioning key. The rotor disclosed by the invention is used in a low-speed high-torque permanent-magnet synchronous direct-drive motor; torque reduction and stress concentration can not be resulted in; and the light weight of the rotor can be realized.