The invention discloses an urban expressway traffic information acquisition system, which comprises a data acquisition unit, a data management unit, an information processing unit, an integrated interface unit, a user application unit and a decision management unit, wherein the data acquisition unit is used for acquiring, gathering and disposing widely distributed multi-source heterogeneous mass traffic data, and the data management unit is used for distributed storage, inquiry, backup and cleansing of the data; the information processing unit is used for cleaning, analyzing and filtering the heterogeneous data to form an information item meeting the standard, and an integrated interface is used for providing standard information to a requester; the user application unit is used for publishing or acquiring the standard information through the relevant interface on a web page, deciding past paired data, disposing, analyzing and providing decision; through cloud computing, the data exchange of the national intelligent transportation system, and system interworking, interconnection and interoperability are realized by big data processing.