Multi-beam antaean feed network and multi-beam antenna array

Embodiments of the invention disclose a multi-beam antaean feed network used for avoiding influence on the feed network caused by length error of branch circuit microstrip lines, and the performance of the feed network is improved. The multi-beam antaean feed network comprises an input port, a first output port and a second output port, a main circuit microstrip line, M first switches and M branch circuit microstrip lines, and a second switch, wherein the input port is used for inputting energy signals; the first output port and the second output port are used for outputting first antennal signals and second antennal signals respectively; the second switch is a single-pole M-throw switch, and comprises a second switch input end and M second switch output ends; the second switch input end is connected with the input port; and the M second switch output ends are connected with the second ends of the M branch circuit microstrip lines respectively. The embodiments of the invention also provide a related multi-beam antenna array.