A method for three-dimensional reconstruction of a target object, comprising the following steps: S10: calculating a visual angle boundary of the target object; S20: acquiring, from each of a plurality of visual angles and by an acquisition device, image information of the target object inside the visual angle boundary, the image information including initial image information and/or fused cut-image information, wherein cut-image information is acquired from different acquisition distances between the acquisition device and the target object; and S30: finishing three-dimensional reconstruction of the target object according to the acquired image information; characterized in that the step S10 further comprises: acquiring, from each of the plurality of visual angles and by the acquisition device, an image of the target object, calculating, for each of the acquired images, a central position of the target object, calculating, for each of the acquired images, a boundary radius of the target object, wherein a circumscribed circle, having the central position as the circle center and the boundary radius as radius, completely contains the target object, comparing all the calculated boundary radiuses of the target object to determine a target maximum boundary radius as the longest boundary radius; and taking an edge formed by the target maximum boundary radius as the visual angle boundary. S10: calculating a visual angle boundary of the target object; S20: acquiring, from each of a plurality of visual angles and by an acquisition device, image information of the target object inside the visual angle boundary, the image information including initial image information and/or fused cut-image information, wherein cut-image information is acquired from different acquisition distances between the acquisition device and the target object; and S30: finishing three-dimensional reconstruction of the target object according to the acquired image information; characterized in that the step S10 further comprises: acquiring, from each of the plurality of visual angles and by the acquisition device, an image of the target object, calculating, for each of the acquired images, a central position of the target object, calculating, for each of the acquired images, a boundary radius of the target object, wherein a circumscribed circle, having the central position as the circle center and the boundary radius as radius, completely contains the target object, comparing all the calculated boundary radiuses of the target object to determine a target maximum boundary radius as the longest boundary radius; and taking an edge formed by the target maximum boundary radius as the visual angle boundary. acquiring, from each of the plurality of visual angles and by the acquisition device, an image of the target object, calculating, for each of the acquired images, a central position of the target object, calculating, for each of the acquired images, a boundary radius of the target object, wherein a circumscribed circle, having the central position as the circle center and the boundary radius as radius, completely contains the target object, comparing all the calculated boundary radiuses of the target object to determine a target maximum boundary radius as the longest boundary radius; and taking an edge formed by the target maximum boundary radius as the visual angle boundary.