The invention provides a distributed cluster-based user service providing system and method applied to live broadcast websites. The system includes a distributed gateway cluster, a management center and a distributed live broadcast room cluster; the distributed gateway cluster includes a plurality of gateway service nodes and is responsible for data interaction between client ends and a live broadcast room service cluster; the management center is used for synchronizing the operating status data of all live broadcast room service nodes in real time and selecting live broadcast room service nodes for newly-built live broadcast rooms; and the distributed live broadcast room cluster includes a plurality of live broadcast room service nodes and is used for processing live broadcast room login logic distributed by the management center. With the system and method of the invention adopted, the bottleneck of maximum concurrency supported by stand-alone performance can be broken, faster services can be provided for more people, and the probability of incapability of providing normal services of the system due to the anomaly of single nodes can be decreased. The system and method have great market value.