The invention discloses a non-metallic waveguide and a manufacturing method. The non-metallic waveguide comprises a tubular non-metallic wall; a non-metallic core is arranged inside the non-metallic wall; and a non-metallic support is connected between the non-metallic wall and the non-metallic core. the special waveguide requirements in special occasions can be remedied to be suitable for accurate measurement of electric field strength, thereby avoiding influences on the electric field by the metal material; the electric field strengths in a unit area are converged, while the influences of absorption and reflection of metal materials on electric fields are avoided, the electric field strength detection sensitivity is improved.