Abstract: In high-current accelerator beam tubes, the flow of charged particles induces a high-frequency field within the tube, which affects the current and stability of the beam. Additionally, this field leads to extra heat loss during the operation of the superconducting cavity, impacting its operational stability. Therefore, it is necessary to effectively control the high-order mode. This study employs ferrite as an absorbing material to absorb high-order modes. The ferrites were welded to copper substrates through metallization and brazing, and then they were joined with the copper beam tube and cooling system to create a ferrite high-order mode damper. The microwave performance of the ferrite high-order mode damper at various frequencies was simulated using CST software, and compared with the measured results. It is found that the high-order mode can be effectively suppressed in the test frequency band, but there are some differences between the two results in a certain frequency band. Additionally, COMSOL software was utilized to simulate the temperature distribution of the ferrite high-order mode damper during operation, and these simulations were compared with experimental data. The test results for loaded power show that the absorption efficiency reaches 77.4% when the absorbed power is 10.14 kW. Furthermore, results of vacuum leak rates, ultimate vacuum and water-resistant all conform to the design requirements for superconducting high-frequency cavities.