Theft-proof alarm device

The utility model aims at overcoming the shortcomings that an existing theft-proof alarm device is large in power consumption and accordingly needs support of power supplies or high-capacity batteries. The theft-proof alarm device is low in power consumption, and accordingly using of the power supplies or the high-capacity batteries is avoided. The theft-proof alarm device comprises a switch module, a power supply module and a detecting module. The switch module is connected between the power supply module and the detecting module. When objects to be detected are moved out of detecting range of the theft-proof alarm device, the detecting module and the power supply module are connected by the switch module. The power supply module supplies power to the detecting module when the power supply module and the detecting module are connected by the switch module. The detecting module generates alarm information when the objects to be detected are moved out of the detecting range of the theft-proof alarm device.