Abstract: A whole-airspace satellite search method and device based on a phased array antenna are provided. The present disclosure combines electronic scanning implemented by the phased array antenna with mechanical scanning implemented by a mechanical actuator. As for low-orbit satellite communication, the present disclosure achieves rapid search and aiming through the phased array antenna, and solves the problem of limited electronic scanning angle of the phased array antenna through a servo system of the mechanical actuator. On the other hand, the present disclosure supports whole-airspace search and aiming of high, medium, and low-orbit satellites through the combination of the electronic scanning implemented by the phased array antenna and the mechanical scanning implemented by the mechanical actuator.