Embodiments of the present invention disclose a dipole antenna and a wireless terminal device, which relate to communications technologies and enable an antenna to have a relatively high performance and a relatively low production cost. The dipole antenna includes a first radiation arm, a second radiation arm, and a balun. The first radiation arm and the second radiation arm are both soldered on a dielectric substrate. The first radiation arm and the second radiation arm are separately connected to the balun electrically. The balun is electrically connected to a feeding point and a reference ground separately. The present invention may be applied to a terminal device.