Abstract: In view of the revision of the verification regulation for infrared thermometers, including infrared ear thermometers and infrared forehead thermometers, and the enormous demand for testing during the epidemic, a integrated test device with three tanks for infrared thermometers was developed. A dark channel was used to increase the liquid circulation rate of thermostatic bath, and a screw cap was used to make the blackbody cavity easy to disassemble for storage. A touchscreen controller was used to control the temperature of the three tanks simultaneously through RS-485, with additional functions such as one-key control and correction provided. The overall testing of the device showed that the device has good temperature stability and temperature field uniformity and high accuracy of brightness temperature, and can greatly improve testing efficiency.