Abstract: The present disclosure is applied to the technical field of data processing, and provided are a capacity-based multi-task scheduling method, apparatus and system. The method comprises: a scheduling node receiving a request for acquiring a task sent by a task executing node, the request carrying with a current load value and an available memory space of the task executing node; and the scheduling node deciding whether the current load value is less than a threshold, and carrying out task scheduling for the task executing node according to the available memory space of the task executing node if the current load value is less than the threshold. The present disclosure can effectively avoid the problems of overload, load, in sufficient memory, etc. of the task execution node, and increase the resource utilization rate of the task execution node and the task scheduling and executing efficiency.