Abstract: A method, a device and a terminal for switching an operating system provided in the present disclosure, are related to a field of information technology and can simplify operations and improve user experience. The method includes: firstly detecting whether a second application in a second operating system is ended when a running operating system in user equipment is switched from a first operating system to the second operating system; switching the running operating system in the user equipment from the second operating system back to the first operating system when the second application is ended, and running a first application. The present disclosure is applicable to the user equipment to switch the running operating system from the second operating system back to the first operating system and run the first application.