As a representative high gain antenna, reflector antenna is widely used in the applications relating to radio. With the development of science and technology, the demand for Ultra-Wideband(UWB) reflector antenna is increasingly urgent. Therefore, in ultra-wide bandwidth, how to achieve good impedance performance, constant beam pattern and fixed phase center for the feed which is the key part of the reflector antenna, has become a hotspot in reflector antenna technologies. This paper gives the key specifications of UWB feed, presents its types, characteristics, and development status quo, as well as the prospects of the future.