The invention discloses an alliance blockchain decentralized consensus method based on a voting mechanism. The method belongs to the technical field of blockchain consensus, and aims at solving the problems that an existing blockchain consensus algorithm based on the mining mechanism is high in computing power expenditure and low in efficiency, the mining mechanism is abandoned, and reliable consensus is achieved through a voting and deposit adding mechanism. According to the method, the consensus efficiency of the alliance blockchain system is greatly improved, the Hash computing power cost and the transaction confirmation time delay are reduced, and the system throughput is improved; meanwhile, the decentralization characteristic of the system is stronger, and the user fairness of the nodes is better; in addition, malicious behaviors in the alliance blockchain system can be greatly inhibited, and the security of the system is effectively improved.