The utility model discloses a wideband dual-polarized omnidirectional ceiling antenna which comprises a round base plate, an antenna cover, a vertically polarized antenna and a horizontally polarized antenna. The base plate and the antenna cover are assembled to cover the vertically polarized antenna and the horizontally polarized antenna. The vertically polarized antenna comprises a round vertically polarized metal board with a through hole disposed in the central portion, a metal support seat that possesses a lead wire hole fixed on in the through hole, and radiation oscillators vertically disposed on the metal support seat. The horizontally polarized antenna is disposed on a round horizontally polarized dielectric slab, wherein the horizontally polarized dielectric slab is positioned above the base plate. The vertically polarized antenna is disposed above the horizontally polarized dielectric slab. A plurality of support pillars penetrate through the horizontally polarized dielectric slab, and fixedly support the vertically polarized metal board and the base plate respectively. The provided antenna has relatively strong environment adaptability, a low standing-wave ratio, a high insulation degree, excellent antenna performance, and a simple and compact structure.