An antenna and a fabrication method of the antenna are provided. The antenna includes a plurality of sub-antennas arranged in an array. A sub-antenna of the plurality of sub-antennas includes a first substrate and a second substrate that are disposed opposite to each other, a dielectric function layer disposed between the first substrate and the second substrate, a ground metal layer disposed on a side of the first substrate facing towards the dielectric function layer, and a metal connector. The first substrate of each sub-antenna is coplanar with each other, and the second substrate of each sub-antenna is coplanar with each other. A spliced region is formed between adjacent two sub-antennas of the plurality of sub-antennas, and in the spliced region, two first substrates of the adjacent two sub-antennas are connected by the metal connector.