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Aiming at the problem of large positioning error of traditional multi-target visual positioning technology, a new multi-target visual positioning technology based on VI-SLAM is proposed. The principle of positioning technology is expounded. The positioning system, the aeronautical attitude measurement system, and the airborne photoelectric measurement platform work together. The multi-target camera is calibrated and the target background difference is locked to determine the position of the target in the camera coordinate system, and the camera coordinate system is converted into the carrier coordinate system. The machine body coordinate system is converted into a geodetic coordinate system to achieve positioning, and the Beidou satellite navigation system and the recursive least squares algorithm are introduced to reduce the positioning error. The experimental results show that compared with the traditional positioning technology, the multi-target visual positioning technology of the quad-rotor UAV based on VI-SLAM has smaller positioning error and wider application.