The invention provides a ground verification method of the performance of a double-circle polarized multiplexed satellite-borne data transmission antenna. A testing system used by the ground verification method comprises a satellite system and a ground system. The ground verification method comprises the following steps: first, the decrement of an attenuator is calculated according to the distance between a satellite system and a ground system and the actual working condition of a satellite in an orbit; mutual directing and aiming are conducted on the satellite-borne double-circle polarized multiplexed data transmission antenna and a ground receiving antenna; a ground verification simulation test is conducted, the satellite and ground combination polarization detectability of a channel one and a channel two and the link margin of the channel one and the channel two are measured, the directing angle of the satellite-borne double-circle polarized multiplexed data transmission antenna and the directing angle of the ground receiving antenna are pulled to be slanting, the satellite and ground combination polarization detectability and the link margin are measured when the directing angles are pulled to be slanting, and further an antenna directing accuracy which meets the demands of a link can be measured. According to the ground verification method of the performance of the double-circle polarized multiplexed satellite-borne data transmission antenna, comprehensive ground verification to the double-circle polarized multiplexed satellite-borne data transmission antenna can be achieved, a basis is provided for in-orbit operation, and risks of the in-orbit operation are reduced.