The invention discloses an antenna assembly with high isolation. The antenna assembly comprises a transmitter antenna, a receiver antenna, a reflecting component and a radome. The transmitter antenna is used for transmitting a radiation wave with a direction of polarization toward the front part, the receiver antenna is used for receiving the radiation wave, and the reflecting component is arranged in front of the transmitter antenna and the receiver antenna for reflecting the radiation wave transmitted from the transmitter antenna. The reflecting component comprises a frame and at least one reflecting grating rod, the frame comprises two cross bars and two vertical bars, each reflecting grating rod is connected to the two cross bars and is parallel to the two vertical bars. The radome provides an accommodating space for accommodating the transmitter antenna, the receiver antenna and the reflecting component.