Abstract: Based on strong entanglement and flexible topological structure of the star cluster state, a novel quantum secret sharing scheme is designed in this paper, which ensures secure transmission of secret information among multiple parties by combining the quantum channel with the classical channel, achieving secure sharing of both classical and quantum secrets. In classical secret sharing, sub-keys are generated through Pauli-Z and Pauli-X measurements and an encryption key is produced through XOR operations, ensuring that the plaintext can be recovered only when all agents cooperate. In quantum secret sharing, Bell basis measurements and local quantum operations are utilized to ensure that only designated agents can reconstruct the original quantum state. The innovation of this scheme is the ability to support multi-bit extended sharing to further enhance the system scalability. Meanwhile, this scheme allows for addition or removal of network users according to practical application requirements in the quantum channels, improving the flexibility. Analysis shows that the proposed scheme can effectively resist the interception-resend attack and the entanglement-measurement attack from unauthorized eavesdroppers, as well as prevent the collusion attack from legitimate participants.