The utility model belongs to the technical field of optical fiber sensing technique and civil structure engineering safety monitoring, a whole freeze thawing inflation strain sensor of monitoring concrete is provided, including coating mortar, two -way single mode bending resistance optic fibre wound wire circle, temperature compensating fiber grating, diameter are 10cm's concrete spheroid, steelpipe, optical cable. The concrete material match ratio of being surveyed the adoption of concrete spheroid with being surveyed concrete structure used is the same, and the two two -way friendship fork-join of single mode bending resistance optic fibre windings are thoughtlessly being congealed spheroidal surface by the survey to measurement concrete spheroid is two -way dilatational strain because of freeze -thaw cycle arouses. The utility model discloses at the lax temperature compensating fiber grating of concrete spheroid fixed surface, and then meeting an emergency of making that the sensor monitors is more accurate, realizes the measurement of temperature inside the reinforced concrete structure simultaneously. Concrete structure's such as dam, bridge freeze thawing inflation strainmonitoring can be applied to to this sensor, have the high accuracy, longe -lived, conveniently characteristics such as lay.