The invention discloses an ETC door frame operation state monitoring system for an expressway, and the system employs an advanced information processing mechanism to complete the real-time processing of big data, achieves the monitoring of all equipment, achieves the evaluation of road network operation indexes, carries out the real-time notification and prompt of resource alarm information, and achieves the multi-layer and multi-point comprehensive combined application. The system comprises a system operation and maintenance cockpit, a monitoring center, a report center, an equipment management sub-module, an operation and maintenance management sub-module, a system management sub-module and the like. Core functions of the monitoring center comprise software version check, heartbeat state statistics, heartbeat real-time state statistics, transmission delay statistics and system alarm information. Core functions of the report center comprise a whole province toll station transaction amount statistical table, expressway exit station traffic flow statistics, expressway truck 10% discount amount statistics, expressway exit traffic flow statistics, bottom-toll rate transaction amount, transaction amount statistics and the like. All kinds of data used by the system are obtained according to a standard interface protocol and a network management protocol.