An orth-mode transducer, OMT, assembly, wherein the OMT assembly comprises: an OMT common port, an OMT feeder, and a polarization separated core, wherein an input end of the OMT common port is connectable to an antenna; one end of the OMT feeder is connected to an output end of the OMT common port, and the other end of the OMT feeder is connected to the polarization separated core, the OMT feeder located between the OMT common port and the polarization separated core is configured to rotate; the OMT feeder is of a tubular structure, and a horizontal axis and a vertical axis of an inner wall cross section of the OMT feeder are unequal, or a tuning rod is disposed in a tube of the OMT feeder, and the tuning rod is perpendicular to an extension direction of the tube of the OMT feeder; and a vertical polarization port and a horizontal polarization port are disposed in the polarization separated core, the vertical polarization port is configured to transmit a vertical polarization wave, and the horizontal polarization port is configured to transmit a horizontal polarization wave, characterized in that: the one end of the OMT feeder is nestedly connected to the output end of the OMT common port, and the other end of the OMT feeder is nestedly connected to the polarization separated core, wherein the OMT assembly further comprises a rotation component, and the rotation component is connected to an outer wall of the OMT feeder, wherein the rotation component comprises an outer hexagon nut, and wherein the OMT assembly further comprises a lock-up component, a through hole is provided on a side wall of the output end of the OMT common port, and the lock-up component passes through the through hole and presses against the OMT feeder in the output end of the OMT common port; and the lock-up component is configured to keep the OMT feeder still after performing rotation adjustment on the OMT feeder. an OMT common port, an OMT feeder, and a polarization separated core, wherein an input end of the OMT common port is connectable to an antenna; one end of the OMT feeder is connected to an output end of the OMT common port, and the other end of the OMT feeder is connected to the polarization separated core, the OMT feeder located between the OMT common port and the polarization separated core is configured to rotate; the OMT feeder is of a tubular structure, and a horizontal axis and a vertical axis of an inner wall cross section of the OMT feeder are unequal, or a tuning rod is disposed in a tube of the OMT feeder, and the tuning rod is perpendicular to an extension direction of the tube of the OMT feeder; and a vertical polarization port and a horizontal polarization port are disposed in the polarization separated core, the vertical polarization port is configured to transmit a vertical polarization wave, and the horizontal polarization port is configured to transmit a horizontal polarization wave, characterized in that: the one end of the OMT feeder is nestedly connected to the output end of the OMT common port, and the other end of the OMT feeder is nestedly connected to the polarization separated core, wherein the OMT assembly further comprises a rotation component, and the rotation component is connected to an outer wall of the OMT feeder, wherein the rotation component comprises an outer hexagon nut, and wherein the OMT assembly further comprises a lock-up component, a through hole is provided on a side wall of the output end of the OMT common port, and the lock-up component passes through the through hole and presses against the OMT feeder in the output end of the OMT common port; and the lock-up component is configured to keep the OMT feeder still after performing rotation adjustment on the OMT feeder. the one end of the OMT feeder is nestedly connected to the output end of the OMT common port, and the other end of the OMT feeder is nestedly connected to the polarization separated core, wherein the OMT assembly further comprises a rotation component, and the rotation component is connected to an outer wall of the OMT feeder, wherein the rotation component comprises an outer hexagon nut, and wherein the OMT assembly further comprises a lock-up component, a through hole is provided on a side wall of the output end of the OMT common port, and the lock-up component passes through the through hole and presses against the OMT feeder in the output end of the OMT common port; and the lock-up component is configured to keep the OMT feeder still after performing rotation adjustment on the OMT feeder.