The low accuracy of temperature measurements is a significant factor that restricts the application of infrared temperature measurements in precise temperature measurement fields. Presently, the primary objects for infrared temperature measurement are those with low reflectivity, referred to as low-reflectivity objects. To address the deficiencies of conventional infrared devices, a reflector infrared device was developed by replacing the lens of a conventional infrared device with a reflector, thereby enhancing its temperature measurement performance on low-reflectivity objects. Calculations and experimental results indicated that, after replacing the F/1 infrared lens with a reflector, the radiation collection capability and temperature measurement accuracy of the infrared device for low-reflectivity objects improved by approximately four times. Furthermore, when the field of view was filled with a low-reflectivity object, the temperature measurement results of the reflector-infrared device were independent of measurement distance. Infrared reflector devices are promising candidates for high-precision infrared temperature measurements in both scientific research and industrial applications.