A target-oriented three-dimensional imaging method and system. The method comprises: determining, on a scanning object, a portion comprising a scanning target using three-dimensional scanning； acquiring, on the basis of the determined portion of the scanning object, an existing preliminary three-dimensional structure (300) of the scanning target； scanning the portion comprising the scanning target to form a series of two-dimensional images with spatial location and angle information； referring to image information related to the scanning target or a local portion of the scanning target within an image, and adjusting the preliminary three-dimensional structure (300) of the scanning target or the local portion of the scanning target； when the preliminary three-dimensional structure (300) of the scanning target has been traversed, then performing adjustments according to an image obtained and displaying on a display device. The method and system only require some preliminary three-dimensional information of an imaging target to be able to use two-dimensional imaging to continuously scan a location of a scanning target, adjust an original shape of the target to obtain an actual size, position, and detail of the target, and form a complete three-dimensional image of the target.
