The invention provides a resource-saving cloud service system and a resource saving method. The cloud service system comprises a cloud server and a cloud client, wherein the cloud server comprises n service nodes, a node management module, a data management module and a node control module, and is used for mounting user data, encoding and sending video streaming, returning, receiving and storing the user data; the cloud client realizes connection and information transmission through the internet and a certain service node of the cloud server. According to the method, through a timeout sleep and timeout turnoff two-stage energy-saving mechanism, if a user leaves for a short time, cpu (central processing unit) consumption is reduced through sleep, and quick connection can be guaranteed after the user comes back; if the user leaves for a long time, consumption of a cpu and a memory is reduced through turnoff. A dynamic sharing mode is adopted among the service nodes for cpu resource consumption of the cloud server, and when one service node is reduced in cpu consumption, saved cpu resources can be used by other nodes immediately.