The invention discloses a break type bugging device, characterized by including a switch, a power supply, a resistance, a relay, an illuminant unit, a speaker, wherein the excitation winding contact of the relay is connected with a serial first switch, the detection loop of the power supply and the first switch; the normally closed contact of the relay is connected with the warning circuit of a serial second switch, the second switch, the power supply, the illuminant unit and the speaker; and the cables are arranged in the metal wires of the antitheft net. The invention has simple structure, wide application range, which is used as the antitheft of the antitheft net, the air condition outdoor machine, the bicycle, the items on display, the luggage carrier, the cable and the livestock, also is used for alarm in the fence, the guard bar, the mountain forest, the orchard and the pound. The invention can be added with a GSM wireless module and a wireless alarm receipt device to realize the alarming signals transmitted to the handset of the client, meanwhile uses the local call net to transmit the alarming signals, the local position to the normal telephone set and the computer of the tenement or the alarm receipt center.