Sliding bearing, sliding bearing fixing structure, fan motor and fan

The invention discloses a sliding bearing and relates to the technical field of bearings. The sliding bearing comprises a bearing body. A fixing ring is fixedly arranged on the outer wall face of thebearing body. The fixing ring is used for making interference contact with the inner wall face of a bearing installing groove. A ring-shaped weakening groove is formed in a rotating shaft through hole. A plane where the end face, away from the bearing outer end face, of the ring-shaped weakening groove is located is a first plane. A plane where the end face, close to the bearing outer end face, ofthe ring-shaped weakening groove is located is a second plane. The fixing ring is located between the first plane and the second plane. The invention further provides a sliding bearing fixing structure which comprises a bearing fixing base and the sliding bearing. The invention further provides a fan motor which comprises a motor shell and a rotating shaft. The motor shell is provided with the sliding bearing fixing struc