In order to deal with the overload problem of smart car server, a dynamic capacity expansion technology of vehicle real-time data transmission architecture based on Kubernetes cluster is proposed. The technology uses Docker to split the architecture into multiple micro-services, and uses the HPA feature of Kubernetes to periodically monitor server CPU resource utilization, trigger expansion rules, and automate the increase and decrease of nodes to achieve capacity expansion. It has been proved by experiments that the dynamic expansion technology of the real-time data transmission architecture based on Kubernetes can realize the dynamic expansion of the architecture. It solves a series of problems caused by server service overload caused by the sudden increase of data sent by the car in a short period of time, and ensures the stability of the service.