Aiming at the new requirements of antenna for low-observable aircraft platform, metasurface antenna with microwave and infrared cross-spectrum and low-observable performance was proposed and designed. To enable the antenna to possess normal radiation properties and absorbing characteristics simultaneously, a novel idea that metasurface design thought integrated into the antenna design was proposed. In this way, radar cross section of the antenna can be reduced without additional loading of the absorbing metasurface, and only by using absorbing characteristics of the antenna structure. On this basis, to realize infrared low-observable of the antenna, metasurface with microwave transparent characteristics and low emissivity characteristics in the infrared band was designed, and it was loaded above the antenna to reduce antenna emissivity. Experimental results show that the novel designed metasurface antenna operates from 2.72 GHz to 2.82 GHz and the maximum gain reaches 6.72 dBi, which indicates the antenna possesses good radiation properties. The reflection magnitudes of the electromagnetic metasurface antenna are all less than -10 dB from 2.70 GHz to 2.80 GHz. The minimum reflection magnitude is -12.49 dB. The emissivity of the antenna is 0.212 by loading the metasurface, which is 0.334 (61.2%) lower than the antenna without metasurface. From the above results, it can be concluded that the novel designed antenna achieves low-observability of both microwave and infrared simultaneously while maintaining normal radiation properties. The novel metasurface antenna provides a novel approach for antenna design of low-observable aircraft platforms.