Novel anti-theft mobile-phone case

The invention relates to a novel anti-theft mobile-phone case. The novel anti-theft mobile-phone case comprises a mobile-phone case body, a circuit module, a light-sensitive resistor, a ceramic piezoelectric loudspeaker, guide lines, a battery installing position and a switch. The novel anti-theft mobile-phone case is characterized in that the circuit module is arranged on the back surface of the mobile-phone case body and consists of a compound amplifying block and a voice module; the circuit module is connected with the light-sensitive resistor, the ceramic piezoelectric loudspeaker, the battery installing position and the switch by the guide lines; all the devices are connected into a compound loop by the guide lines; a button battery is arranged in the battery installing position; when a user puts a mobile phone into the pocket, the switch can be turned on, since the brightness in the pocket is lower, the resistance value of the light-sensitive resistor is larger, and the ceramic piezoelectric loudspeaker can not give out a sound, and after a theft steals the mobile phone from the pocket, the resistance value of the light-sensitive resistor can become small instantaneously due to outdoor strong sunshine, and the current in a circuit becomes large, so that the ceramic piezoelectric loudspeaker gives out a sound. The novel anti-theft mobile-phone case is simple in structure and easy in manufacture.