Butler matrix of dual-beam antenna and dual-beam antenna

The utility model provides a Butler matrix of a dual-beam antenna. The Butler matrix comprises a first-stage bridge, a power division network and a second-stage bridge, wherein the first-stage bridge, the power division network and the second-stage bridge all adopt a gradually-deformed slotted coupling structure of a multi-layer circuit board; the two output ends of the first-stage bridge are respectively connected with the input end of the power division network and/or the input end of the second-stage bridge, and the two output ends of the power division network are respectively connected to the input end of the second-stage bridge and/or are directly connected with the radiation units of the antenna sub-arrays; two output ends of the second-stage bridge are respectively connected with the radiation units of the antenna sub-arrays; signals form P paths of output signals through the output end of the first-stage bridge and/or the output end of the power division network; and the P paths of output signals are