A chain belt retainer , configured to retain a plurality of rolling elements (B), the chain belt retainer characterized by comprising: two flexible chain belts , being parallel to each other and extending in the same extending direction, the two flexible chain belts defining a central surface (C); and a plurality of spacers , being arranged at equal intervals and along the extending direction, the spacers being separately connected between the two flexible chain belts , the spacers being divided into first separators and second separators by the central surface (C), the first separators being located on the same side of the central surface (C), each first separator comprising a far end away from the central surface (C), the far end being provided with a long slot , and the long slot being perpendicular to the extending direction; wherein a sectioned surface of the long slot is V-shaped, the long slot has a slot bottom edge and a first slope and a second slope connected to two opposite sides of the slot bottom edge , characterised in that the first slope and the second slope are convex curved surfaces; wherein the long slot divides the first separator into a first elastic retaining slice and a second elastic retaining slice , the first elastic retaining slice has a first root , the first root is adjacent to the central portion relative to the first end , and a thickness of the first end is less than a thickness of the first root , the second elastic retaining slice has a second root , the second root is adjacent to the central portion relative to the second end , and a thickness of the second end is less than a thickness of the second root . two flexible chain belts , being parallel to each other and extending in the same extending direction, the two flexible chain belts defining a central surface (C); and a plurality of spacers , being arranged at equal intervals and along the extending direction, the spacers being separately connected between the two flexible chain belts , the spacers being divided into first separators and second separators by the central surface (C), the first separators being located on the same side of the central surface (C), each first separator comprising a far end away from the central surface (C), the far end being provided with a long slot , and the long slot being perpendicular to the extending direction; wherein a sectioned surface of the long slot is V-shaped, the long slot has a slot bottom edge and a first slope and a second slope connected to two opposite sides of the slot bottom edge , characterised in that the first slope and the second slope are convex curved surfaces; wherein the long slot divides the first separator into a first elastic retaining slice and a second elastic retaining slice , the first elastic retaining slice has a first root , the first root is adjacent to the central portion relative to the first end , and a thickness of the first end is less than a thickness of the first root , the second elastic retaining slice has a second root , the second root is adjacent to the central portion relative to the second end , and a thickness of the second end is less than a thickness of the second root . <EOS>