The embodiment of the invention provides an outbound task scheduling method and an outbound task scheduling device of a three-dimensional library monitoring system. The method comprises the steps of receiving outbound tasks sent by a management system, wherein the outbound tasks carry priority levels; respectively sending the outbound tasks to task queues corresponding to the priority levels according to the priority levels of the outbound tasks; and performing the outbound tasks in the task queues from high to low according to the priority levels. According to the outbound task scheduling method, the priority levels of the outbound tasks are set, and the outbound tasks are performed according to the priority levels, so that the task with high priority level is performed first, the delay of the outbound tasks is avoided, and the outbound tasks are reasonably and accurately scheduled and are flexibly and scientifically managed.