In order to improve the performance of the airborne UV alarm sensor and match the localization requirements，a UV alarm sensor based on the ICMOS architecture was designed. The working wavelength of this type of sensor covered 250～270 nm，and the alarm target information could be uploaded through the RS422 interface. It had the advantages of ultra-wide angle，high-angle resolution，high sensitivity，light weight，and low power consumption. The technical indicators，working principle and design framework of the sensor were introduced. The basic function and performance test of the sensor were completed，and it was verified by the environmental test to meet the requirements of airborne use.