Omnidirectional antenna and electronic device

The invention provides an omnidirectional antenna and an electronic device. The antenna comprises a dielectric substrate including two surfaces, a first radiation unit and a second radiation unit, wherein the first radiation unit is arranged on one surface of the dielectric substrate and comprises a first long arm and a first short arm a certain distance away from the first long arm; and the second radiation unit comprises a second long arm and a second short arm a certain distance away from the second long arm, the second long arm and the second short arm are respectively opposite to the first short arm and the first long arm, and a gap is formed between the first long arm and the second long arm. The omnidirectional antenna provided by the invention is a dual-frequency broadband omnidirectional antenna, can work in two frequency bands; the impedance is adjustable and the center frequency point can also be adjusted as required; and an electronic device employing the omnidirectional antenna can achieve wireless signal transmission based on IEEE 802.11, and can meet the demand of wireless signal coverage within a certain region.