The invention provides an intelligent body visual and three-dimensional positioning method based on double cameras and an intelligent body visual and three-dimensional positioning device based on double cameras. The intelligent body visual and three-dimensional positioning method comprises the following steps: (1) arranging the double cameras on an intelligent body, and enabling a main axis of the first camera to be vertical to that of the second camera; (2) adopting the two cameras to carry out three-dimensional positioning of monocular vision on the same object, and respectively obtaining a first positioning result and a second positioning result; (3) carrying out fusion processing on the first positioning result and the second positioning result so as to obtain an optimal three-dimensional positioning result, wherein the fusion processing comprises the following steps: replacing a Z component of the first camera with an X component of the second camera, and replacing a Z component of the second camera with an X negative component of the first camera. The intelligent body visual and three-dimensional positioning method and intelligent body visual and three-dimensional positioning device provided by the invention have the advantages that monocular-vision positioning data of the two cameras is ingeniously fused, further errors of the two cameras in the three-dimensional positioning depth direction are fused, and the direct proportion to the square of the depth is reduced to direct proportion to the depth, so that normal positioning of a visual system is guaranteed.