Abeam scanning antenna, comprising: a multi-feed antenna, a feed switching module, and a switching control module, wherein the multi-feed antenna comprises an aperture unit and at least two feeds, wherein the feeds are configured to radiate an electromagnetic wave signal, and the aperture unit is configured to focus the electromagnetic wave signal by means of reflection or refraction; the feed switching module comprises multiple switches, wherein each feed is respectively connected to one switch; and the switching control module is connected to the feed switching module, and the switching control module is configured to enable, by using the feed switching module, each feed to perform signal quality detection, and select one feed having the best signal quality as a working feed; wherein the at least two feeds comprise one first feed and at least one second feed; the first feed is placed at a focal point of the aperture unit, and after being reflected or refracted by the aperture unit, a beam sent by the first feed is parallel to the axis of the aperture unit; and the second feed is placed at a periphery of the first feed, and after a beam sent by the second feed is reflected or refracted by the aperture unit, an angle is formed between the beam and the axis of the aperture unit, characterized in that centers of the second feeds are evenly placed on a circle perpendicular to the axis of the aperture unit, the center of the circle is located on the axis of the aperture unit, a distance between a projection of the second feed on a focal plane and the focal point is R, the focal plane is a plane that is perpendicular to the axis of the aperture unit and at which the focal point is located, the center distance between two adjacent second feeds is d, radiation apertures of the second feeds are on a same plane, a distance between the radiation apertures of the second feeds and a radiation aperture of the first feed is δ, and δ is greater than or equal to zero; wherein R meets: R ≤ F × tan θ × 1 + k D / 4 F 2 1 + D / 4 F 2; and d meets: d ≤ 2 R 2 + F 2 − 2 R 2 + F 2 cos θ / 2 + φ / 2, wherein F is the focal length of the aperture unit, D is the diameter of the aperture unit, k is a constant less than or equal to 1, φ is a beam angle of an aperture radiation beam of the second feed, and θ is a beam angle of an aperture radiation beam of the first feed. a multi-feed antenna, a feed switching module, and a switching control module, wherein the multi-feed antenna comprises an aperture unit and at least two feeds, wherein the feeds are configured to radiate an electromagnetic wave signal, and the aperture unit is configured to focus the electromagnetic wave signal by means of reflection or refraction; the feed switching module comprises multiple switches, wherein each feed is respectively connected to one switch; and the switching control module is connected to the feed switching module, and the switching control module is configured to enable, by using the feed switching module, each feed to perform signal quality detection, and select one feed having the best signal quality as a working feed; wherein the at least two feeds comprise one first feed and at least one second feed; the first feed is placed at a focal point of the aperture unit, and after being reflected or refracted by the aperture unit, a beam sent by the first feed is parallel to the axis of the aperture unit; and the second feed is placed at a periphery of the first feed, and after a beam sent by the second feed is reflected or refracted by the aperture unit, an angle is formed between the beam and the axis of the aperture unit, characterized in that centers of the second feeds are evenly placed on a circle perpendicular to the axis of the aperture unit, the center of the circle is located on the axis of the aperture unit, a distance between a projection of the second feed on a focal plane and the focal point is R, the focal plane is a plane that is perpendicular to the axis of the aperture unit and at which the focal point is located, the center distance between two adjacent second feeds is d, radiation apertures of the second feeds are on a same plane, a distance between the radiation apertures of the second feeds and a radiation aperture of the first feed is δ, and δ is greater than or equal to zero; wherein R meets: R ≤ F × tan θ × 1 + k D / 4 F 2 1 + D / 4 F 2; and d meets: d ≤ 2 R 2 + F 2 − 2 R 2 + F 2 cos θ / 2 + φ / 2, wherein F is the focal length of the aperture unit, D is the diameter of the aperture unit, k is a constant less than or equal to 1, φ is a beam angle of an aperture radiation beam of the second feed, and θ is a beam angle of an aperture radiation beam of the first feed.