The invention discloses a micro-strip antenna unit and an array thereof and belongs to antennas. The antenna unit comprises a first dielectric substrate and a second dielectric substrate positioned over the first dielectric substrate, wherein a primary radiation patch is arranged over the first dielectric substrate, a parasitic patch and a covering dielectric slab are arranged over the second dielectric substrate, an earth plate is arranged under the first dielectric substrate, and a baffle board is arranged under the earth plate. Through arrangement of the parasitic patch in the micro-strip antenna unit, under the assistance of the covering dielectric slab, resonance gain is achieved, the grain value of the micro-strip antenna is improved effectively; aperture-coupled feed of an H-shaped groove and direct feed of the primary irradiation patch are not performed in the same layer of the antenna unit, therefore the isolation is effectively improved, a micro-strip feed network is simple after array combination of the antenna unit, and the using loss is low; and simultaneously, the micro-strip antenna unit and the array can be widely applied to aviation airborne computer systems, and are simple in structure, suitable for industrial production and easy to popularize.