The invention belongs to the field of radar technology and communication technology, in particular to a tightly coupled antenna array with wide bandwidth, wide angle and low profile. The antenna arraycomprises a supporting member composed of a supporting plate, a supporting plate frame, a reflecting plate and a feeding joint, and an antenna line composed of a Wilkinson power divider, a feeding balun, a radiation current sheet and a frequency selection surface; The antenna line is laminated by two dielectric copper clad plates, and are divided into four layers: circuit structure layers of theupper and lower layers of an upper layer dielectric plate and circuit structure layers of the upper and lower layers of a lower layer dielectric plate; the first and fourth layers are in a symmetricalradiation structure, the second layer is an empty plate, and the third layer is provided with the power divider and balun. The first and fourth layers are electrically connected through conductive vias to provide a closed environment for the third layer and suppress energy leakage. The radiation current sheet is symmetrically distributed, which can reduce the impedance at the point where the balun is coupled with the current sheet. Frequency selective surface is located on the third layer, which can be used to replace the impedance matching dielectric layer on the current sheet, so that the antenna can be fabricated and installed more easily.