The invention relates to a long-distance optical fiber grating sensing transducer. An optical fiber end surface matching fluid container, an optical fiber sensor array, a wavelength division multiplexer, an erbium-doped fiber, an optical isolator are sequentially disposed in the upper part of a mounting plate from left to right, an optical fiber end surface matching fluid is filled in the opticalfiber end surface matching fluid container, one end of the optical fiber sensor array is disposed inside the optical fiber end surface matching fluid, the other end of the optical fiber sensor array is connected with one input end of the wavelength division multiplexer via an optical fiber, a pumping laser is disposed in the lower part of the mounting plate, the output end of the pumping laser isconnected with the other input end of the wavelength division multiplexer via an optical fiber, the output end of the wavelength division multiplexer is connected with one end of the erbium-doped fiber, and the other end of the erbium-doped fiber is connected with one end of the optical isolator with an optical fiber. The invention has the advantages of high signal-to-noise ratio, wide detection range, high resolution and measurement accuracy, long transmission distance, good reliability, and low production cost; and can be used for long-distance detection of temperature, pressure, pipeline deformation strain in oil and gas pipelines.