The invention provides a high-performance small-structure SMA connector and belongs to the connector technology field. The connector comprises an outer conductor, a connection nut, a waterproof rubber ring and a snap ring. The connection nut wraps an external portion of the outer conductor. A connection position of the outer conductor and the connection nut is provided with the waterproof rubber ring. The snap ring is inlaid in an outer end of the outer conductor. When the connector is connected to a cable, an inner core of the cable is directly served as an inner conductor of the connector and the outer conductor is welded on a cable outer conductor so that there are few parts, cost is low and assembling time is short.