The embodiment of the utility discloses a cavity filter which comprises a cavity and a resonance rod made of silicon nitride materials, wherein the surface of the resonance rod is provided with a metal layer; the resonance rod is contained in the cavity; and compared with the traditional resonance rod made of invar material, the resonance rod made of silicon nitride material has the advantages of low cost, good drift index and high production efficiency. In addition, the embodiment of the utility model also discloses communication equipment adopting the cavity filter. The cavity filter is arranged on a signal transceiver circuit of the communication equipment, and equipment cost can be effectively lowered because the resonance rod made of the silicon nitride material is adopted.