The invention relates to a phase correction sticker on a reflector of an antenna, which comprises a first base plate, a second base plate and a plurality of artificial microstructures arranged between the first and second base plates. The artificial microstructures are wires made of conductive materials. The first and second base plates are flexible. The refractive index of the phase correction sticker on the reflector of the antenna is reasonably designed, so that emergent electromagnetic wave reflected by the reflector of the antenna attached with the phase correction sticker on the reflector of the antenna has a leveled equiphase surface. According to the phase correction sticker on the reflector of the antenna provided by the invention, the refractive index distribution is arranged inside the phase correction sticker, so that the phase correction sticker on the reflector of the antenna is attached to conventional reflectors to correct the emergent phase from the surface of the reflector and improve the phase error brought by installation or process, so that a leveled emergent equiphase surface is obtained, and further the far field performance (such as higher gain) of the antenna is improved.