The invention discloses a network traffic monitoring method based on an Android single-core multi-system, comprising: registering a network protocol data structure; when any network namespace is being created or invoked, establishing a connecting relationship between the network namespace and the network protocol data structure and creating a network traffic monitoring data structure on the network namespace to monitor the traffic data of the network namespace; and when the network namespace is being canceled, invoking the network protocol data structure to disconnect the connecting relationship between the network namespace and the network protocol data structure. According to the present invention, it is possible and only possible to view the traffic statistic information of the network interfaces and each APP of a user's own system on any system. For the case involving a single-core multi-system, the traffic statistic information of the multi-system can be realized independently, making the network traffic statistics more isolated and more secure.