Abstract: A user protection method using a smart phone case includes: installing a screen-lock application driven with electric signals of at least one of a fingerprint recognition sensor and the case of the smart phone and a reporting application running in conjunction with the screen-lock application, and setting a predetermined option; unlocking the smart phone and simultaneously running the reporting application, if a registered fingerprint is recognized in the fingerprint recognition sensor or if the smart phone receives an electric signal; sending a designated server report data created by capturing and recording a field situation through a camera and microphone of the smart phone that work in conjunction with the reporting application; and linking report data to a predetermined website, converting an address of the website and position information of the smart phone into text message formats, and sending the conversion results to a guardian's smart phone.