The present invention proposes a mobile Internet-oriented security audit method and system, belonging to the technical field of computer network security, including: a network data collection module, a data preprocessing module, a business feature library module, an audit rule module, and an audit module, and also includes: Network management and control module, network management and control rule library module. The mobile terminal accesses the mobile Internet through the mobile network management unit, and the network data acquisition module collects the data transmitted by the mobile terminal through the mobile network and performs classification and preprocessing through the data preprocessing module, and matches and identifies network data through the business feature database type, sent to the audit module for audit, and network management through the network control module. The present invention provides monitoring, analysis, management, optimization and control functions for mobile Internet business, performance, quality and safety, so that mobile Internet management can be managed, controlled and checked, and a green and safe Internet environment can be effectively maintained.