The invention discloses a permanent magnet motor protection structure. The protection structure comprises a motor shell, wherein a shaft extension end of the motor shell is fixedly connected with a front end cover, a through hole is formed in the center of the front end cover, the through hole is matched with an output shaft, a top end of the output shaft is fixedly connected with a coupler, the side, close to the front end cover, between the front end cover and the coupler is sleeved with an oil seal cover, the side, close to the oil seal cover, between the oil seal cover and the coupler is provided with a dustproof water throwing ring, and a non-shaft-extension end of the motor shell is provided with a rear end cover. The diameter of a non-mounting end of the dustproof water throwing ring is slightly larger than that of a non-mounting end of the oil seal cover, rainwater on a surface of the oil seal cover can be smoothly thrown out through the dustproof water throwing ring, and siltcan be effectively prevented from entering an inner surface of the oil seal cover, a ventilation valve is arranged, the ventilation valve can effectively prevent external water and water vapor from entering the motor cavity, meanwhile, the water vapor in the motor cavity can be discharged, and that no water vapor condensation exists in the motor is guaranteed.