The invention discloses a wide-band flat gain laminated dielectric patch antenna, the antenna comprises one layer of printed circuit board which is printed with circuit on both sides, one layer of dielectric substrate and three layers of dielectric slices which are laminated from bottom to top in sequence, the three layers of dielectric slices comprise a first dielectric thin slice on the topmost layer, a dielectric thick slice on the middle layer and a second dielectric thin slice on the lowest layer, wherein the first dielectric thin slice and the second dielectric thin slice are made from a material with dielectric constant epsilon 1, the dielectric thick slice is made from a material with dielectric constant epsilon 2, epsilon 1 is greater than epsilon 2, and epsilon 1 is 5 times more than epsilon 2. According to the invention, compared with dielectric resonator antenna in the prior art, the wide-band flat gain laminated dielectric patch antenna has higher gain and lower profile; and compared with common dielectric patch antenna, the antenna provided by the invention has wider bandwidth.