A task scheduling method and apparatus, a device, and a medium are provided. According to the task scheduling method, a target running category of an application is determined from a plurality of predefined running categories based on a running status of the application, where applications in different running categories in the plurality of predefined running categories have different importance levels. A target classification priority corresponding to the target running category is determined. A target scheduling priority of a target task in the application is determined based on at least the target classification priority. A resource of a processing system is scheduled to the target task based on the target scheduling priority, for running of the target task.