The invention discloses a dielectric waveguide filter. The dielectric waveguide filter comprises a plurality of dielectric single cavities which are connected with each other, wherein the dielectric single cavities are solid cavities made of the dielectric material; electromagnetic shielding layers are arranged on the surfaces of the solid cavities. According to the dielectric waveguide filter disclosed by the invention, cavities, namely air parts, of a conventional metal cavity waveguide filter are filled with the dielectric material according to different dielectric constants of the air and medium, and the electromagnetic shielding layer is arranged on the surface of the dielectric material to carry out electromagnetic shielding; meanwhile, the dielectric material is used for supporting, so that the designed dielectric waveguide filter has advantages of being small in size, light in weight, low in cost, having an environment-friendly effect and the like, and can satisfy development trends such as small size, light weight, low cost, high performance and environmental protection of products such as future filters, duplexers and multiplexers.