Target fiber grating rheometer

The invention relates to a target fiber grating rheometer, which has small measurement volume, high precision, good waterproof property and electromagnetic interference resistance, and can perform real-time monitor in different environments such as pipeline, crack and the like. The target fiber grating rheometer comprises a casing, one end of which is connected with a measurement joint and the other end of which is provided with an end cover; the end cover is equipped with a fixed metal sheet which is connected with a cantilever beam, the cantilever beam is provided with a measurement grating, the measurement grating is connected with fibers passing through the end cover; the end of the cantilever beam is provided with a metal target sheet arranged inside the measurement joint, and the cantilever beam is provided with a sealing device.