The invention provides a low-RCS (radar cross-section) micro-strip antenna based on a dual-polarization Van Atta array. The micro-strip antenna comprises a radiation unit, coaxial feeders and an improved 2*2 dual-polarization array based on the dual-polarization Van Atta array, the 2*2 dual-polarization array comprises a first dielectric substrate and a second dielectric substrate which are vertically overlapped, the radiation unit and 2*2 metal patches on the periphery radiation unit are printed on the upper surface of the first dielectric substrate, a metal floor is printed on the lower surface of the first dielectric substrate, 2*2 groups of micro-strip feeders, two first micro-strip connecting lines and two second micro-strip connecting lines are printed on the lower surface of the second dielectric substrate, the electrical lengths of the first micro-strip connecting lines are equal to those of the second micro-strip connecting lines, the first micro-strip connecting lines and thesecond micro-strip connecting lines are used for connecting two feeders in one group of micro-strip feeders and two feeders in the other group of micro-strip feeders on two diagonal lines, and energyis transmitted to the metal patches through 2*2 groups of slot-coupling or connecting patches etched on the metal floor and 2*2 groups of metal columns of the micro-strip feeders. The antenna is different from a conception in the prior art, and radiation and low radar scattering cross-section characteristics of the antenna can be simultaneously ensured.