The invention provides an urban intelligent transportation system, which comprises an LED transportation induction information release system, a video monitoring system, a transportation information flow detection system, an overspeed capturing system and a public security clamping port system; the LED transportation induction information release system displays the input content in a screen dividing mode according to the mode set by a user through big data processing and analysis; the video monitoring system implements visual monitoring on the whole road sections through a high-definition camera; the transportation information flow detection system detects transportation information of the vehicle flow, the vehicle speed and the occupation ratio of the road sections of all intersections in real time through a microwave radar technology; the overspeed capturing system detects overspeed vehicles through microwave radar; and the public security clamping port system records clear photographs of the passing vehicles and identifies the license plate numbers accordingly. According to the urban intelligent transportation system, the transportation information is collected through big data, processing and analysis are conducted according to the specific transportation information, thus the transportation system is optimized and managed, operation is convenient and quick, and the resultis accurate.