The invention discloses a microstrip array antenna. The microstrip array antenna comprises a reflection substrate disposed horizontally and an antenna body installed on the substrate, the antenna body is manufactured by a sheet metal in an integrated stamping manner, the antenna body comprises a plurality of sheet-like radiation parts disposed parallel to the reflection substrate and elongated transmission microstrips connected between the adjacent radiation parts, the middle position of each transmission microstrip extends horizontally and is provided with a feed-in part in a suspended manner, and the transmission microstrips between the feed-in parts and the radiation parts are provided with a plurality of adjustment parts.