A time-switch device and method for the same is provided. The time-switch device mainly comprises a microprocessor unit, and an input element and a key secret element that are connected to the microprocessor unit. The microprocessor unit is connected to a data storage unit storing the time switch method and to a power control unit to control the connected host turning ON or OFF in a predetermined time of the schedule set in the time switch method stored in the time-switch device. Thus, the time-switch device and method for the same may not only force a user to use the host in a limited service time, but also prevent data in the host from being leaked.