GRUtopia is a 3D social simulation platform for various robots that provides a feasible path for robot learning through the Sim2Real paradigm. The platform contains 100k finely annotated interactive scenarios that can be freely combined into city-scale environments, covering 89 different scene categories and providing a foundation for the deployment of general-purpose service robots in service-oriented environments. In addition, GRUtopia includes an NPC system powered by a large language model (LLM) responsible for social interaction, task generation, and allocation, simulating social scenarios in embodied AI applications.