This paper introduces the technical characteristics of blockchain and its technical advantages in the military application of UAV swarm, and proposes a blockchain architecture for the military application of UAV swarm. Then, it comprehensively sorts out the current research status of the military application of UAV swarm based on blockchain, and analyzes the challenges and solutions of the current blockchain technology in the military application of UAV swarm, which provides research ideas for the future military application of UAV swarm based on blockchain technology.