The invention discloses an expansion and contraction device easy to change a waterproof sealing tape. The expansion and contraction device easy to change the waterproof sealing tape comprises anchoring profiles mounted at the end parts of beam bodies on the two sides of an expansion joint; the anchoring profiles comprise through cavities, fixed cavities, through cavity openings and fixed cavity openings; the expansion and contraction device easy to change the waterproof sealing tape further comprises the waterproof sealing tape connected between the two anchoring profiles; the waterproof sealing tape comprises a tape body and an ear tapes; the ear tapes comprise fixed cavity opening sections, fixed cavity sections and through cavity opening sections; the fixed cavity opening sections are in clearance fit with the fixed cavity openings; the fixed cavity sections are in interference fit with the fixed cavities; and the through cavity opening sections are in interference fit with the through cavity openings. The invention aims at providing the expansion and contraction device easy to change the waterproof sealing tape to solve the problem that the sealing effect of the existing expansion and contraction device is poor. The expansion and contraction device easy to change the waterproof sealing tape has the advantages that the waterproof sealing tape is easy to change, and the connection positions between the waterproof sealing tape and the anchoring profiles can also be more accurate so that the sealing performance of the expansion and contraction device is improved.