1. A device for analyzing thermal images, comprising: an acquiring part for acquiring thermal imaging data; a body information selecting part for selecting body information from the body information prestored in a storage medium, the storage medium being used for storing the body information and constituted data related to the body information; the body information being an information representing a position, a type, a number, a name of a photographed body, or a combination thereof; the constituted data being a vector image data, a lattice data, or a combination thereof; the body information is composed of attribute information of multiple attributes, and the body information is finally selected via display and multiple selections for the attribute information of multiple attributes of the body information; a display controlling part for controlling to display a reference image acquired by the constituted data and an infrared thermal image generated by the acquired thermal imaging data together according to a position parameter of the reference image located in the infrared thermal image, the reference image reflecting morphological characters of the photographed body; the reference image being acquired according to the constituted data related to the selected body information; the morphological characters of the photographed body reflecting at least one of a texture and a contour of the photographed body; a thermal image analyzing part for analyzing the thermal imaging data acquired by the acquiring part to acquire an analysis result, according to a specified analysis mode, based on a specified analysis area; the device for analyzing thermal images is a portable thermal imager; wherein a self-adaption is performed for computing a position parameter of a contour of the reference image in the infrared thermal image according to a centered position of a self-adaptive area, and then a position parameter of a specified portion of the reference image in the infrared thermal image is determined according to a specified position relation between the specified portion of the reference image and the contour of the reference image.