This application provides a beamforming method and apparatus. The beamforming method includes: receiving, by a feeding network, electrical signals from a beamforming module, and separately outputting the electrical signals to a plurality of antenna ports on an antenna array, where the electrical signals received at the antenna ports are used to control shapes of beams formed by the antenna array, and an amplitude of an electrical signal output by the feeding network to each antenna port on the antenna array, and a phase difference between electrical signals shunted to different antenna ports on the antenna array change with an operating frequency of the antenna array. By using technical solutions provided in this application, shape-maintaining capabilities of beams formed by the antenna array can be improved.