Plastic sealing strip

The utility model discloses a plastic sealing strip which comprises a conical tooth level soft strip, a tearing soft thin strip, an identification label plate and a back locking tooth level device. A rack through hole is formed in the middle of the identification label plate, and an annular positioning groove is formed in the periphery of the rack through hole in the back face of the identification label plate. The outer edge of the annular positioning groove protrudes upwards to be connected with a short pipe column, a pipe cavity is formed in the short pipe column, a pipe outlet is formed in the top of the short pipe column, and the diameter of the pipe outlet is equal to or slightly larger than the maximum diameter of the conical tooth-level soft strip; an inner concave annular wall groove is formed in the side wall of the root part of the inner bottom of the pipe cavity; the annular positioning groove, the pipe cavity and the inwards-concave annular wall groove are jointly fixed with a back locking tooth