The invention discloses a safety check device and an imaging method thereof. The safety check device includes: a first image capturing device for scanning a to-be-checked object to obtain a global image of the to-be-checked object; a second image capturing device for scanning a preset region of the to-be-checked object to obtain a to-be-checked a partial image of the object, wherein the partial image is a three-dimensional image of the preset area; a processor which is coupled to the first image capturing device and the second image capturing device, and is used for fusing the partial image with the global image to obtain a safety check image of the to-be-checked object, wherein the resolution of the partial image is greater than the resolution of the global image. In this way, the sharpness of the image of the to-be-checked object can be improved.