This application provides an antenna, including a folded antenna, a dipole antenna, and a coupling structure. An extension direction of a primary radiator of the folded antenna is a first direction, an extension direction of a primary radiator of the dipole antenna is a second direction, and the first direction is orthogonal to the second direction. In the second direction, the folded antenna is disposed at one end of the dipole antenna, an operating frequency of the folded antenna is a first frequency band, an operating frequency of the dipole antenna includes a second frequency band, and the first frequency band is higher than the second frequency band. The coupling structure is connected between the folded antenna and the dipole antenna, in the second frequency band, the coupling structure generates resonance, so that the folded antenna participates in radiation of the dipole antenna, and in the first frequency band, the coupling structure has an isolation function. In this application, horizontal omnidirectional radiation and vertical directional radiation of an antenna in a plurality of frequency bands are implemented, and the antenna has an advantage of a small size. This application further provides an antenna module and a wireless network device.