Novel floor armored expansion joint

The embodiment of the utility model discloses a novel floor armored expansion joint, which is characterized in that a protection mechanism comprises a dustproof plate for preventing foreign matters from entering a gap between two pieces of concrete; a connecting plate used for supporting the dustproof plate is fixedly installed at the bottom end of a plate body of the dustproof plate, a first groove used for left-right sliding of the expansion joint is formed in the top end face of the dustproof plate, and second grooves used for left-right moving of the expansion joint after contraction of concrete are formed in the front wall body and the rear wall body in the first groove. By arranging the protection mechanism, when concrete shrinks, the first seam formwork and the second seam formwork are pulled through a tension bar, bolts made of plastic materials can be broken, and under the action of a first groove, a second groove, a connecting column and a sliding column, a dustproof plate can prevent sundries from