In recent years, under the background that the rapid development of traffic volume makes the current traffic lights far from meeting the urban traffic demand, intelligent traffic lights based on the centralized architecture began to appear. However, in the traffic network with complex structure and private data flow, there are many malicious attacks against the centralized architecture, such as Sybil and ghost car attacks, which undoubtedly brings great security risks to the traditional intelligent traffic lights. Blockchain technology is a popular security framework nowadays. Based on its outstanding characteristics in the distributed architecture and the development of Edge Intelligence (EI) technology, this paper proposes a distributed security architecture scheme based on blockchain technology for the existing intelligent traffic light system. At the same time, based on the model cutting technology proposed by EI, the smart contract is improved to achieve redundant cutting of ledger data in the process of block consensus, which greatly reduces the pressure of blockchain ledger data transmission. In the end of this paper, the superiority of this scheme compared with the traditional intelligent traffic light scheme in communication cost and time cost is demonstrated by simulation experiment.INDEX TERMS Blockchain, intelligent transportation, distributed architecture, edge intelligence.PENGJIE ZENG is currently pursuing the bachelor's degree from the Hunan University of Science and Technology. His research field is the application of blockchain in the Internet of Things, cyberspace security, privacy protection, and large data processing and analysis. He received the Second Prize at the National College Students Innovative Electronic Design Competition and the Third Prize at the School-Level Financial Management Data Analysis Competition. He is currently in charge of leading the Technical Team to complete the development of a smart agriculture project and an intelligent traffic light project.