A ball reflow component, comprises: a ball cage comprising a long groove, a plurality of first recessed portions, a plurality of second recessed portions, a first side portion, and a second side portion corresponding to the first side portion, wherein the plurality of first recessed portions are arranged on the first side portion, and the plurality of second recessed portions are arranged on the second side portion; a first end cover assembled on the first side portion of the ball cage, wherein the first end cover comprises a first curve and a plurality of first protruding portions, one of two ends of the first curve corresponds to one of two ends of the long groove, and the plurality of first protruding portions are correspondingly arranged in the plurality of first recessed portions; and a second end cover assembled on the second side portion of the ball cage, wherein the second end cover comprises a second curve and a plurality of second protruding portions, one of two ends of the second curve corresponds to the other end of the long groove, and the plurality of second protruding portions are correspondingly arranged in the plurality of second recessed portions characterized in that: two opposite end portions of the long groove are respectively provided with a first guide groove and a second guide groove, the first guide groove is curvedly connected to the first curve, and the second guide groove is curvedly connected to the second curve; wherein the first guide groove and the second guide groove extend in a direction deviated from a length direction of the long groove. a ball cage comprising a long groove, a plurality of first recessed portions, a plurality of second recessed portions, a first side portion, and a second side portion corresponding to the first side portion, wherein the plurality of first recessed portions are arranged on the first side portion, and the plurality of second recessed portions are arranged on the second side portion; a first end cover assembled on the first side portion of the ball cage, wherein the first end cover comprises a first curve and a plurality of first protruding portions, one of two ends of the first curve corresponds to one of two ends of the long groove, and the plurality of first protruding portions are correspondingly arranged in the plurality of first recessed portions; and a second end cover assembled on the second side portion of the ball cage, wherein the second end cover comprises a second curve and a plurality of second protruding portions, one of two ends of the second curve corresponds to the other end of the long groove, and the plurality of second protruding portions are correspondingly arranged in the plurality of second recessed portions characterized in that: two opposite end portions of the long groove are respectively provided with a first guide groove and a second guide groove, the first guide groove is curvedly connected to the first curve, and the second guide groove is curvedly connected to the second curve; wherein the first guide groove and the second guide groove extend in a direction deviated from a length direction of the long groove. two opposite end portions of the long groove are respectively provided with a first guide groove and a second guide groove, the first guide groove is curvedly connected to the first curve, and the second guide groove is curvedly connected to the second curve; wherein the first guide groove and the second guide groove extend in a direction deviated from a length direction of the long groove.