A stator for a single-phase outer-rotor motor, comprising a stator core, the stator core including: a yoke; and a plurality of teeth extending outwardly from an outer edge of the yoke, each of the teeth including: a tooth body connected with the yoke, a winding slot formed between each two adjacent tooth bodies; and a tooth tip formed at a distal end of the tooth body, a slot opening formed between each two adjacent tooth tips, the tooth tip having a width in a circumferential direction greater than that of the tooth body and thus protruding beyond the tooth body in the circumferential direction, inner surfaces of at least part of the tooth tips facing a center of the stator being formed with cutting grooves such that a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and deformed inwardly to narrow the slot opening, wherein the tooth tips of a half of the plurality of teeth are formed with the cutting grooves, the tooth tips of the other half of the plurality of teeth are not formed with the cutting grooves, and the tooth tips with the cutting grooves are spacingly and alternatively arranged in the circumferential direction; and the cutting grooves are formed so as to not be eliminated when the portions of the tooth tips outside the corresponding cutting grooves are deformed inwardly until the tooth tips form outer arc surfaces. a yoke; and a plurality of teeth extending outwardly from an outer edge of the yoke, each of the teeth including: a tooth body connected with the yoke, a winding slot formed between each two adjacent tooth bodies; and a tooth tip formed at a distal end of the tooth body, a slot opening formed between each two adjacent tooth tips, the tooth tip having a width in a circumferential direction greater than that of the tooth body and thus protruding beyond the tooth body in the circumferential direction, inner surfaces of at least part of the tooth tips facing a center of the stator being formed with cutting grooves such that a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and deformed inwardly to narrow the slot opening, a tooth body connected with the yoke, a winding slot formed between each two adjacent tooth bodies; and a tooth tip formed at a distal end of the tooth body, a slot opening formed between each two adjacent tooth tips, the tooth tip having a width in a circumferential direction greater than that of the tooth body and thus protruding beyond the tooth body in the circumferential direction, inner surfaces of at least part of the tooth tips facing a center of the stator being formed with cutting grooves such that a portion of the tooth tip outside the cutting groove is capable of being tilted outwardly to enlarge the slot opening and deformed inwardly to narrow the slot opening, wherein the tooth tips of a half of the plurality of teeth are formed with the cutting grooves, the tooth tips of the other half of the plurality of teeth are not formed with the cutting grooves, and the tooth tips with the cutting grooves are spacingly and alternatively arranged in the circumferential direction; and the cutting grooves are formed so as to not be eliminated when the portions of the tooth tips outside the corresponding cutting grooves are deformed inwardly until the tooth tips form outer arc surfaces.