The invention provides a workflow scheduling method based on hybrid cloud. The workflow scheduling method comprises the following steps: detecting whether private cloud has an idle server set or not;when existence is determined, screening a target idle server from the idle server set, screening an unscheduled task of which the completion time is less than the deadline and the completion time andthe deadline are closest to each other from the unscheduled task set, and scheduling the unscheduled task to the target idle server; and when it is determined that the unscheduled tasks do not exist,screening the rented target virtual machine from the public cloud, screening the unscheduled tasks of which the completion time is less than the deadline and the completion time is closest to the deadline from the unscheduled task set, and scheduling the unscheduled tasks to the target virtual machine. According to the technical scheme of the invention; the task with the completion time closest tothe deadline is scheduled to the local resource or the public resource with the highest cost performance, on the premise that constraints such as task dependence and workflow deadline are met, the task scheduling method is not limited to independent tasks, the applicability is wider, and the private resource utilization rate and the public resource expenditure are greatly optimized.