The invention provides a three-dimensional model characteristic extract method based on relevancy information and a device thereof. The method mainly includes: depth images respectively corresponding to each face of a three-dimensional model are acquired, relevancy of each depth image and the three-dimensional model is calculated; the relevancy of each depth image and the three-dimensional model is weighted into the characteristic vector corresponding to the corresponding face of each depth image, so as to obtain the characteristic vector of the three-dimensional model. By utilizing the invention, characteristic extraction can be effectively carried out on the three-dimensional model, and the calculated characteristic vector of the three-dimensional model can accurately show the characteristic information of the three-dimensional model.