The utility model relates to the technical field of bearings, and particularly relates to a novel single-row angular contact ball bearing. The single-row angular contact ball bearing is provided with a bearing outer ring and a bearing inner ring, wherein an annular retainer is arranged between the bearing outer ring and the bearing inner ring; a plurality of balls are embedded into the retainer; an inclined angle alpha formed by radial direction and a connection line of contact points of the bearing outer ring and the bearing inner ring and the balls is 10-25 degrees; an annular stopping groove is formed in the outer surface of the bearing outer ring; an arch-shaped groove capable of being filled with lubricating oil is formed in a roller path of the bearing inner ring. The novel single-row angular contact ball bearing is simple in structure and reasonable in design, can simultaneously bear a radial load and an axial load and can work at a relatively high rotation speed; the greater a contact angle is, and the higher the radial bearing capability is.