The invention relates to a three-CCD temperature field measuring device, comprising an optical lens, a beam splitting prism group, three CCD area array sensors and a data acquisition and analysis unit; wherein the optical lens is used for optically imaging and focusing radiations of objects to be measured on an incident plane of the beam splitting prism group; the beam splitting prism group equally divides the projected radiations into three waveband radiations in distinct directions, and the three waveband radiations exit from three exit planes respectively; the three CCD area array sensors are arranged at the three exit planes of the beam splitting prism group respectively, thus imaging the three exit radiations that pass through light filters of different spectrum transmittance distribution and obtaining three spectrum-irrelative CCD images; and the data acquisition analysis unit acquires the data of the three CCD images and utilizes a multispectral temperature measurement method for the temperature field calculation. The invention also relates to a corresponding temperature field measurement method. The inventive technical proposal can achieve the temperature field measurement and can be widely applied; in addition, the technical proposal is simple and feasible, and easy for popularization and application in the field of industrial production, such as high-temperature detection, etc.