A magnetic pole fixing device of a permanent magnet wind power generator, for fixing a plurality of magnetic pole modules on a rotor of the permanent magnet wind power generator, wherein the magnetic pole fixing device of the permanent magnet wind power generator comprises: a plurality of first fixing block assemblies , disposed on a surface of the rotor adjacent to an air gap and extending toward an exterior of the rotor, wherein the plurality of first fixing block assemblies are disposed along a circumferential direction of the rotor and spaced apart from each other in said circumferential direction, and each of the first fixing block assemblies comprises a plurality of first fixing blocks disposed along an axial direction of the rotor and spaced apart from each other in said axial direction; a plurality of second fixing block assemblies , where each of the second fixing block assemblies comprises at least one left second fixing block and at least one right second fixing block , which are disposed at two opposing side surfaces of the magnetic pole module respectively; a plurality of radial limiting assemblies , configured to limit a movement of the magnetic pole modules along a radial direction of the rotor ; wherein the air gap is a gap between the rotor and a stator, an accommodation space for accommodating one of the magnetic pole modules is formed between adjacent two of the first fixing block assemblies , and adjacent two of the first fixing block assemblies limit a movement of the magnetic pole module accommodated in the accommodation space along the circumferential direction of the rotor ; the left second fixing block or the right second fixing block is embedded between adjacent two of the first fixing blocks in each of the first fixing block assemblies , to limit the movement of the magnetic pole module along the axial direction of the rotor . a plurality of first fixing block assemblies , disposed on a surface of the rotor adjacent to an air gap and extending toward an exterior of the rotor, wherein the plurality of first fixing block assemblies are disposed along a circumferential direction of the rotor and spaced apart from each other in said circumferential direction, and each of the first fixing block assemblies comprises a plurality of first fixing blocks disposed along an axial direction of the rotor and spaced apart from each other in said axial direction; a plurality of second fixing block assemblies , where each of the second fixing block assemblies comprises at least one left second fixing block and at least one right second fixing block , which are disposed at two opposing side surfaces of the magnetic pole module respectively; a plurality of radial limiting assemblies , configured to limit a movement of the magnetic pole modules along a radial direction of the rotor ; wherein the air gap is a gap between the rotor and a stator, an accommodation space for accommodating one of the magnetic pole modules is formed between adjacent two of the first fixing block assemblies , and adjacent two of the first fixing block assemblies limit a movement of the magnetic pole module accommodated in the accommodation space along the circumferential direction of the rotor ; the left second fixing block or the right second fixing block is embedded between adjacent two of the first fixing blocks in each of the first fixing block assemblies , to limit the movement of the magnetic pole module along the axial direction of the rotor . <EOS>