The invention relates to a decentralized cross cluster resource management and task scheduling system and a scheduling method. The scheduling system comprises a subsystem for providing management and coordination service, a subsystem for providing computing service and a subsystem for providing access service, the subsystem for providing the management and coordination service acquires information of other subsystems, provides monitoring, reporting, billing, resource sharing coordination work, and provides decision reference for management and planning of a high-performance computing system. The subsystem for providing the computing service is provided with a data center of a high-performance computing node and collects local and remote resources, so that work scheduling is performed according to the local and remote resources. The subsystem for providing the access service provides localized work submission and access management service for a user. The decentralized cross cluster resource management and task scheduling method integrates single cluster resources, on one hand, work execution efficiency and user experience are improved, on the other hand, existing resources are effectively and maximally used, and the cost for purchasing hardware to expand computing power is saved.