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.