Unlike　the　traditional　one-to-one　identity　authentication,　group　identity　authentication　is　group　oriented　and　can　authenticate　all　users　belonging　to　the　same　group.　In　this　paper,　we　propose　a　dynamic　quantum-group　authentication　protocol.　Using　a　special　entangled　state,　i.e.,　the　starlike　cluster　state,　the　quantum　identity　authentication　center　in　a　group　can　authenticate　all　users　belonging　to　the　same　group.　In　addition,　the　protocol　has　the　following　characteristics.　(1)　The　number　of　users　participating　in　group　authentication　can　change　dynamically,　i.e.,　new　users　are　allowed　to　join　group　authentication,　and　the　old　users　are　allowed　to　exit　group　authentication.　(2)　When　new　users　join　or　old　users　exit　group　authentication,　the　authentication　keys　of　all　the　old　users　do　not　need　to　be　redistributed.　Compared　with　the　existing　quantum-group　authentication　protocols,　the　proposed　protocol　is　more　flexible　and　suitable　in　practical　scenarios.　©　2022　Chinese　Academy　of　Sciences.　All　rights　reserved.