The invention relates to the field of cloud computing technology, and particularly relates to a method for counting the traffic of a virtual machine extranet of a cloud platform. The method mainly comprises the steps of firstly, when establishing the mapping of an extranet IP with a virtual machine private network for the virtual machine, obtaining a virtual interface used by the virtual routing bound with the extranet IP; then, establishing a sub-queue for counting the traffic on the virtual interface, establishing a matching rule of the extranet IP, and binding the rule on the sub-queue; when the virtual machine accesses the extranet, binding the rule on the queue, and recording the traffic; periodically obtaining the latest traffic information on the sub-queue by a traffic counting Agent, reporting the latest traffic information to a network server and storing the latest traffic information in a database; and finally, providing a traffic processing service by the network server according to the traffic information in the database. The method provided by the invention can be used for effectively counting the traffic information of the extranet on the virtual routing, and can be used for counting the traffic of the virtual machine extranet.