In order to study the reflection characteristics of infrared low emissivity camouflage coating in Terahertz(THz) wave, the coating was prepared and its characteristic parameters such as visible image, infrared thermal image and infrared emissivity were tested. The complex refractive index of khaki-yellow infrared low emissivity coating in THz band was obtained by using the transmission THz time domain system. The characteristic matrix theory was analyzed, which was used to calculate the reflection spectrum of the coating in THz wave carried by the change of coating thickness(0.3~0.5mm) and incident angle(0°~60°) respectively. The results show that THz wave has multiple reflection peaks below 0.8 THz, and the maximum value is more than 90%. The result shows that the detection to metal targets that are coated by the infrared low emissivity camouflage coating by applying THz wave is meaningful. In addition, the thickness change of the coating has a great influence on the reflectivity of incident terahertz wave. The thicker the coating, the more reflection oscillation the THz wave has and the greater reflection peak value of it.The incident angle has a certain influence on the reflection characteristics of THz wave, but the overall effect is small, which is beneficial to the detection of multi-angle target by THz wave. Finally, the reflection characteristics of the metal plate coated with 0.42 mm thickness coating in 0.1~1.5 THz were measured, and the experimental results were compared with partial theoretical calculation results. The results demonstrate that the experimental results are in good agreement with the theoretical results, but there are also some deviations. The reason is mainly caused by sample thickness and sample parameter error, but the characteristic matrix theory still can be used to study the reflection spectrum of THz wave by infrared low emissivity stealth coating.