The invention provides a Fabry-Perot antenna with a high gain and a low radar cross section. By adoption of a three-layer antenna coating design, the Fabry-Perot antenna has a radar cross section lower than that of a traditional microstrip antenna under the premise of having better radiation characteristics than the traditional microstrip antenna; and the Fabry-Perot antenna provided by the invention comprises an antenna radiation body, a feed structure, a metal floor, a first wave absorbing coating and a second reflection coating, which are printed on upper and lower surfaces of a first dielectric substrate, and a third reflection coating printed on the lower surface of a second dielectric substrate; the first wave absorbing coating is composed of N*N square wave absorbing units that have the same structure and are periodically arranged, and the second reflection coating and the third reflection coating are respectively composed of N*N square metal ring patches and square metal patchunits, which have the same structure and are periodically arranged. The Fabry-Perot antenna provided by the invention solves the technical problem of poor in-band radar cross section reduction effectin the prior art, greatly improves the gain of the antenna, and is suitable for the field of guided missile radar and satellite communication requiring low observable characteristics.