An apparatus for testing a radio frequency index of an active antenna system, characterized by comprising a shielding box, a positioning bracket, a calibration antenna part, an antenna radio frequency line part, a test probe, a probe location adjustment unit and a retractable absorbing plate, wherein: The calibration antenna part has a dipole structure and composition mode same as an antenna feeder part of the tested active antenna system, configured to be used for calibration of the testing apparatus, and each branch of the antenna radio frequency line part is electrically coupled to each branch of the calibration antenna part, respectively; the test probe is a standard antenna dipole; the shielding box is configured to: form a space electromagnetic environment between the testing apparatus and the tested active antenna system or the calibration antenna part; the retractable absorbing plate is located between the positioning bracket and the test probe; and the positioning bracket is configured to: fix the calibration antenna part or the tested active antenna system, and adjust orientation of the calibration antenna part or the tested active antenna system; wherein when calibrating the testing apparatus, a part of the retractable absorbing plate between the test probe and the dipole corresponding to a branch of the calibration antenna part that is being tested is unfolded, and other parts of retractable absorbing plate at other locations are folded; when testing the tested active antenna system, the calibration antenna part and the antenna radio frequency line part are replaced by the tested active antenna system, a part of the retractable absorbing plate between the test probe and the dipole corresponding to a branch of the tested active antenna system that is being tested is unfolded, and other parts of retractable absorbing plate at other locations are folded. The calibration antenna part has a dipole structure and composition mode same as an antenna feeder part of the tested active antenna system, configured to be used for calibration of the testing apparatus, and each branch of the antenna radio frequency line part is electrically coupled to each branch of the calibration antenna part, respectively; the test probe is a standard antenna dipole; the shielding box is configured to: form a space electromagnetic environment between the testing apparatus and the tested active antenna system or the calibration antenna part; the retractable absorbing plate is located between the positioning bracket and the test probe; and the positioning bracket is configured to: fix the calibration antenna part or the tested active antenna system, and adjust orientation of the calibration antenna part or the tested active antenna system; wherein when calibrating the testing apparatus, a part of the retractable absorbing plate between the test probe and the dipole corresponding to a branch of the calibration antenna part that is being tested is unfolded, and other parts of retractable absorbing plate at other locations are folded; when testing the tested active antenna system, the calibration antenna part and the antenna radio frequency line part are replaced by the tested active antenna system, a part of the retractable absorbing plate between the test probe and the dipole corresponding to a branch of the tested active antenna system that is being tested is unfolded, and other parts of retractable absorbing plate at other locations are folded.