The invention discloses a comprehensive energy monitoring system and method, and belongs to the comprehensive energy application technology, and the system comprises a plurality of comprehensive energy sensors, a wireless sensing node, and a comprehensive energy monitoring device. Each comprehensive energy sensor comprises an RFID tag, and the RFID tag stores a corresponding transmission interfacetype, a transmission interface subtype and a communication protocol. Each wireless sensing node comprises a main control unit, a Zigbee module and an RFID reading module. The method is based on an RFID technology and a WSN technology. The wireless sensing node can realize self-identification and data acquisition of various types of sensors. Meanwhile, collected data is transmitted to the comprehensive energy monitoring device through the ZigBee module, so that the type and complexity of the interface device accessed to the system are reduced, the installation and maintenance efficiency of thesystem is improved, and support is provided for real-time monitoring of the comprehensive energy system.