1. A real-time multi-task scheduling method performed by a processor in a computing system for dynamically scheduling a plurality of tasks in the computing system, wherein the method comprises: determining that laxity correction should be performed for a currently scheduled task, wherein a laxity of the currently scheduled task refers to a remaining idle time after the currently scheduled task is completed; acquiring a remaining execution time of the currently scheduled task according to an execution progress of the currently scheduled task and a time for which the currently scheduled task has been executed, wherein the execution progress is a task completion proportion in the currently scheduled task; acquiring the laxity of the currently scheduled task according to the remaining execution time of the currently scheduled task and a deadline of the currently scheduled task; determining a first priority of the currently scheduled task according to the laxity of the currently scheduled task; re-determining a priority queue according to the first priority of the currently scheduled task, wherein the priority queue is used to record a priority of the plurality of tasks, wherein a second priority of the currently scheduled task in the priority queue is determined by a laxity acquired according to the deadline of the currently scheduled task and a required execution time of the currently scheduled task, and wherein the required execution time of the currently scheduled task is a previously acquired remaining execution time; and scheduling the plurality of tasks according to the priority queue.