A permanent magnet direct-drive wind power generator, comprising a stator, a rotor, and an air source system, wherein the stator comprises: a stator support, a stator iron core arranged around an outer peripheral wall of the stator support, a blade side tooth pressing plate, and a blade side surrounding plate; wherein the blade side tooth pressing plate is arranged on an axial end face at a blade side of the stator iron core, and the rotor matching with the stator has a rotor sealing ring; characterized in that at least one first air hole is provided in the outer peripheral wall of the stator support, and at least one second air hole is provided in the blade side tooth pressing plate, wherein the air source system is connected to the first air hole in order to introduce an air flow through the first air hole; the stator further comprises at least one air flow passage via which the first air hole and the second air hole are in communication with each other, and the at least one air flow passage extends through an interior of the stator iron core; at least one comb tooth air inlet hole is provided on a side, close to the rotor, of the blade side surrounding plate, the comb tooth air inlet hole and the second air hole are connected via an air guide pipe; and a first spiral comb teeth mechanism is provided on a side, close to the rotor sealing ring, of the blade side surrounding plate, the first spiral comb teeth mechanism as a whole is annular and is in communication with the at least one comb tooth air inlet hole, the first spiral comb teeth mechanism has first comb teeth, the first spiral comb teeth protrude into an annular gap formed by the blade side surrounding plate and the rotor sealing ring for generating an airflow with spiral motion in the annular gap, when the air flow is introduced through the first air hole. a stator support, a stator iron core arranged around an outer peripheral wall of the stator support, a blade side tooth pressing plate, and a blade side surrounding plate; wherein the blade side tooth pressing plate is arranged on an axial end face at a blade side of the stator iron core, and the rotor matching with the stator has a rotor sealing ring; characterized in that at least one first air hole is provided in the outer peripheral wall of the stator support, and at least one second air hole is provided in the blade side tooth pressing plate, wherein the air source system is connected to the first air hole in order to introduce an air flow through the first air hole; the stator further comprises at least one air flow passage via which the first air hole and the second air hole are in communication with each other, and the at least one air flow passage extends through an interior of the stator iron core; at least one comb tooth air inlet hole is provided on a side, close to the rotor, of the blade side surrounding plate, the comb tooth air inlet hole and the second air hole are connected via an air guide pipe; and a first spiral comb teeth mechanism is provided on a side, close to the rotor sealing ring, of the blade side surrounding plate, the first spiral comb teeth mechanism as a whole is annular and is in communication with the at least one comb tooth air inlet hole, the first spiral comb teeth mechanism has first comb teeth, the first spiral comb teeth protrude into an annular gap formed by the blade side surrounding plate and the rotor sealing ring for generating an airflow with spiral motion in the annular gap, when the air flow is introduced through the first air hole.