An electronic device includes a first housing, a second housing, a metal wall disposed between the first housing and the second housing, and an antenna module. The first housing includes a non-metal part. The second housing includes a heat-dissipating vent area corresponding to the position of the non-metal part. The heat-dissipating vent area includes metal connecting bars and air outlets formed therebetween. A cavity is defined by the non-metal part, the metal wall, and the heat-dissipating vent area. The antenna module is in the cavity. The antenna module includes a first antenna layer including a feeding end, a first radiator, and a second radiator and is configured to resonate at a first frequency band and a second frequency band. A length of the first radiator is ¼ wavelength of the first frequency band, and a length of the second radiator is ¼ wavelength of the second frequency band.