The utility model discloses a novel sensor lead's protection device, it contains steel pipe (1), this steel pipe (1) whole L type structure that is, the one end of steel pipe (1) is sealed to be provided with steel disk (2), offers hole (3) that supplied sensor lead that the several has a perfect understanding the setting passed on this steel disk (2), steel disk (2) and steel pipe (1) between welded fastening be connected, wire and hole (3) between bond through gel foam fixed, rubber sleeve (4) are established to another pot head of steel pipe (1), and the laminating that the tip is inseparable of this rubber sleeve (4) is on inner formword (5). The utility model has the advantages of reasonable design, simple to operate, what the wire of having guaranteed the sensor can stand intact passes in the precast concrete tube coupling to take out smoothly and carry out follow -up work, prevent again that the concrete setting from putting the thermal damage wire, the infiltration of thoroughly having stopped the concrete, it must be extravagant greatly to have reduced financial resources and material resources.