The invention provides an antenna unit. The antenna unit comprises a reflection board, a radiator and a feed cable, wherein the radiator is installed on the reflection board, and the feed cable achieves feed for the radiator. The radiator comprises a sealed winding metal conductor, at least a group of half-wave dipoles, and folded dipoles, wherein the half-wave dipoles extend inwards from the winding metal conductor and are installed oppositely, the folded dipoles are matched with the half-wave dipoles, and the folded diploes are located on the winding metal conductor and are connected with the winding metal conductor. Therefore, according to the radiator of the antenna unit, the folded diploes are installed on the winding metal conductor and are matched with the half-wave dipoles, the resonance frequency of the antenna unit can range from 1700 megahertzes to 2200 megahertzes, and at the same time, the gain of the antenna unit can achieve more than 12 dBi.