The acoustic waveguide has a flexible metal rod with a cylindrical waveguide rigidly attached to each end of the same through a conical acoustic concentrator. One cylindrical waveguide is capable of being attached to an electroacoustic transducer and the other cylindrical waveguide is capable of being attached to an acoustic oscillation receiver. The structure provides for the enhanced functional capabilities of the acoustic waveguide by utilizing it in devices operating under conditions of high temperature, radiation, strong electromagnetic interferences and other negative factors.