Anti-stretching composite sealing strip for building

The utility model discloses a building anti-stretching composite sealing strip which comprises a dense rubber base body, a sponge foaming base body and fiber lines, the sponge foaming base body is arranged above the dense rubber base body, and the fiber lines are buried in the dense rubber base body in the length direction. The sealant base body, the sponge foaming base body and the fiber lines are formed at a time in a co-extrusion mode. The section of the sponge foaming base body is of a semi-circular structure, and the section of the dense rubber base body is of a T-shaped structure. The sponge foaming base body is a sponge foaming adhesive serving as a sealing body. According to the utility model, the transverse flexibility of the rubber is very small due to the obstruction effect of the internal fiber lines, so that the rapid assembly of the building door and window sealing strip and the profile is realized; the fiber yarns are very fine, so that the longitudinal elasticity of thesealing strip is not inf