Provided are a display protector attaching apparatus for a smart device and an attaching method thereof. The display protector attaching apparatus for the smart device of the present invention includes a base portion provided with a receiving groove in which a smart device is received; a cover portion coupled to the base portion to cover the smart device received in the receiving groove; and a lifting supporter detachably coupled to a coupler provided in the base portion to support one side of a display protector attached to the smart device, in which when the lifting supporter is separated from the coupler, the display protector is detached from the display of the smart device placed with a liquid adhesive member to be attached to the display.