The present invention relates to a bus monitoring host data acquisition method and a bus monitoring host data acquisition system. The method includes the following steps that: data transmission, memory buffering and local storage are carried out on acquired data concurrency; network state monitoring is carried out in the processes of data transmission, memory buffering and local storage; when a network connection is abnormal, network state monitoring is carried out continuously until the network connection returns to normal; if the memory capacity of a monitoring host can satisfy a requirement for complete storage of data acquired in a network anomaly period, data stored in the memory of the monitoring host in the network anomaly period are transmitted supplementarily; and if the memory capacity of the monitoring host cannot satisfy the requirement for complete storage of the data acquired in the network anomaly period, data stored in a local large-capacity memory in the network anomaly period are transmitted supplementarily. The system includes a main control unit as well as a data acquisition module, a data storage module, a data transmission module, a data supplementary transmission module and a communication module which are connected with the main control unit. With the method and system of the invention adopted, it can be ensured that data will not be lost in a network outage situation, and the reliability of the monitoring host can be greatly increased.