Millimeter wave imaging system for security check and imaging method thereof

The invention discloses a millimeter wave imaging system for security check and an imaging method thereof, wherein the system comprises a millimeter wave MMIC receiver array, a parabolic antenna, a two-dimensional mechanical scanning rotary table and a signal processing unit; the millimeter wave MMIC receiver array is connected with the signal processing unit, a feed source antenna of the millimeter wave MMIC receiver array is placed on the focal plane of the parabolic antenna, and both the millimeter wave MMIC receiver array and the parabolic antenna are fixed on the two-dimensional mechanical scanning rotary table. The imaging system of the invention has simple structure and high stability and can effectively detect hidden arms on a human body.