The invention provides an ultra-
wideband target electromagnetic scattering characteristic test
system and method. The method includes: firstly, measuring a calibration object on a rotary table by fixing a first group of feed sources working on a first
frequency band on a support capable of automatically switching the feed sources so as to continuously switch 2-27GHz plane
waves emitted by the feed sources, and receiving reflected echo data; secondly, still performing 2-27GHz measurement by replacing a target object at the position of the calibration object; thirdly, after test ends, keeping the target object stationary, measuring the target object on the rotary table by 27-40GHz plane
waves emitted by a second group of feed sources working on a second
frequency band and receiving reflected echo data; fourthly, placing the previous calibration object at the position of the target object, performing calibration testing through the second
frequency band, and receiving calibrated reflected echo data. Through the
test data and by combining the data integrating technology, ultra-
wideband target electromagnetic scattering characteristics of the target object can be acquired.