The invention discloses an urban bus passenger flow survey method based on platform video analysis and a survey system thereof. The system comprises a real-time video access server, a video analysis server, a real-time memory data storage, a bus intelligent dispatch system, a dispatch communication server, a vehicle-mounted GPS dispatching terminal and a platform camera. Through the analysis of bus station real-time monitoring video data and intelligent bus dispatching data, the passenger flow survey method which can accurately identify boarding/alighting stations and transfer and riding time of passengers is established.