Client network traffic metering and billing instrument and using method thereof

The invention discloses a client network traffic metering and billing instrument which has the advantages that the client network traffic metering and billing instrument is used for trade settlement, is convenient for national metrological quantity value transmission and consumer monitoring, has a high measurement accuracy, ensures a network efficiency and has a high safety performance; traffic data is difficult to falsify; the network abnormal problems of broadcast storm and the like are reduced; and the manufacturing cost is low. The client network traffic metering and billing instrument comprises a micro control unit MCU, a double-port Ethernet controller, a storage unit, a card reading module, a USB (Universal Serial Bus) communication module and a network interface module; the MCU is respectively connected with the double-port Ethernet controller, the storage unit, the card reading module and the USB communication module by a memory SRAM (Static Random Access Memory)-like interface, an IC2 (Integrated Ci