<p>Semi-quantum secret sharing (SQSS) is an important research topic of quantum cryptography. In most SQSS protocols, lots of decoy particles only are used to perform eavesdropping detection and are discarded finally, which results in a significant waste of quantum resources. Meanwhile, many protocols use entangled quantum resources, and their qubit efficiency is also less than 100%. The paper proposes a new multi-party SQSS protocol that uses single-particle states to transmit information. Decoy particles are used to both carry shared secret information and detect eavesdropping. Its advantages over existing protocols are as follows: (1) Decoy particles can not only detect eavesdropping but also carry secret information, which can improve the utilization of decoy particles and save quantum resources. (2) The new protocol uses single particles as the quantum resources. The preparation of single-particle states is easier than that of entangled states. (3) The shared secret information is jointly determined by each participant, effectively avoiding impersonation attacks initiated by the secret distributor. (4) The qubit efficiency of this protocol reaches 100%. In addition, security analysis shows that the protocol can resist the adversary’s eavesdropping as well as collusion attacks, dishonest participant attacks, and so on. Therefore, the proposed protocol has a better performance in security, practicality, and efficiency.</p>