Abstract: In order to solve the problem that the passenger flow monitoring of urban rail transit mainly focused on artificial high-intensity observation, the degree of intelligence was low, and the dimension of detection data was single, this paper designed a composite passenger flow information intelligent detection system based on intelligent video monitoring, mobile terminal detection, multiple data fusion and other technologies. From the perspective of the integration of passenger transport business and new technology, the paper carried out the overall design and detailed description of the system's overall architecture, logical architecture, technical architecture and functional architecture, and clarified the system construction ideas, implemented the functions such as intelligent collection of basic passenger flow information, identification of abnormal events, analysis of evolution situation. The system is of great significance for improving the passenger flow active safety assurance ability and passenger transport service quality.