Embodiments of this application provide an antenna apparatus and an electronic device, and relate to the field of antenna technologies, to resolve a problem of antenna bandwidth limitation caused by a small quantity of excitation modes on a same antenna. The antenna apparatus includes a circuit board and an antenna body. The antenna body includes a first radiator and a second radiator that are indirectly coupled. A first end of the first stub and a first end of the second stub are opposite to, but do not touch each other, a first gap is configured between the first end of the first stub and the first end of the second stub, the first stub and the second stub are located on a first side edge of the circuit board, a second gap is configured between the first stub and the first side edge, and the second gap is configured between the second stub and the first side edge. The second radiator is located on the circuit board, and a third gap is configured between the second radiator and a first surface of the circuit board. A vertical projection of the second radiator is located on the first surface. A second end of the first stub and a second end of the second stub are electrically connected to reference ground of the circuit board separately. In this way, the antenna body is equivalent to dual antennas with high isolation.