The invention discloses a system and a method for multi-tenant network stability monitoring based on a cloud platform. The system and the method ensure stability of an IPv4 network and an IPv6 network in a virtual machine. The method comprises: S1, establishing an OpenStack cloud platform; S2, integrating an SDN with the OpenStack cloud platform Neutron, to realize network resource virtualization; S3, acquiring IPv4 and IPv6 data, and converting the IPv6 data to IPv4 data through IVI; S4, through a Panabit device, identifying and monitoring and counting the IPv4 and IPv6 network data, and combined with a SDN controller of the SDN device, performing QOS regulation. The system and the method can solve problems of cloud platform multi-tenant network stability monitoring, ensure stability of the IPv4 network and the IPv6 network in the virtual machine, optimize network connection speed, improve network service quality monitoring, and improve network QOS and user experience.