<p>With the development of quantum computing, classical signature techniques are facing growing security challenges. In this paper, we propose a dynamic group multi-party quantum signature scheme based on extended quantum teleportation. Our scheme, which uses Greenberger–Horne–Zeilinger (GHZ) states to transmit information, allows for the addition or removal of participants at will. It realizes the dynamic management of group signature permissions and identity authentication by virtue of the state transmission of extended quantum teleportation. The signature process relies on the entanglement characteristics of GHZ states to accomplish the secure transmission and collaborative verification of information, and achieves a good balance between signature efficiency and security. Consequently, it is well suited for scenarios requiring collaborative authorization, such as decentralized systems and documents that require signatures from multiple departments. The security analysis demonstrates that the scheme is unforgeable, undeniable, and secure against interception-forgery attacks. We further validated the feasibility of our scheme through simulation experiments on Qiskit.</p>