A method for keeping tracking of a target includes the steps: establishing a search area on the distance between an image acquisition part and a center position of the target, obtaining a plurality ofsampling points on the search area, setting the center position of the image acquisition part at the sampling points in turn, and setting the direction of the field of view of the image acquisition part as the vector between the sampling points and the center position of the target; at all the sampling points, rotating cameras in the direction of the field of view at the same time, according to internal parameters and external parameters of the cameras, performing virtual continuous exposure shooting in a computer until an intentional position is found out, and obtaining all mark points of the target by the cameras at the same time. The method provided by the invention can effectively solve the operation interruption caused by occlusion of a human body, medical instruments and tissues andorgans to a tracking target in the operation process, so as to make the operation sustainable and ensure the continuity of the operation.