The invention provides a high-speed camera automatic focusing system and method, processor and computer device. The high-speed camera automatic focusing system comprises a high-speed camera, a focusing lens thereof, and two auxiliary cameras which are set at left and right sides of the high-speed camera. The two auxiliary cameras and the high-speed camera are mounted at the same height of the sameplatform. The front end mirror surfaces of the three cameras are located on the same plane. Image information of a photographed object is obtained through the left and right auxiliary cameras. The focal distance to which the high-speed should be adjusted is determined according to the image information and a set object distance-focal distance corresponding relationship. A motor drives the focusing lens of the high-speed camera to carry out focusing. According to the system, the method, the processor and the computer device, the target distance information is obtained through utilization of the auxiliary cameras, thereby realizing focusing, so the constraint among image collection, storage and focusing processing is removed and the image obtaining speed is improved; and the focal distanceof the high-speed camera is adjusted in a table lookup mode, so the focusing processing computing quantity is greatly reduced, and the focusing speed is improved.