Micro-alarm against thieves

The utility model relates to a micro-alarm anti-thief device. A snap fastener switch which is sewed in a pocket is connected and inserted in a patch cord of a power supply; a clamp type switch is connected and inserted in an alarm device composed of a casing, a vibrating motor, a power supply, a switch and a socket; the utility model is composed of the snap fastener, a triplex socket and the alarm device which are combined together. The circuit of the alarm device can be automatically switched on and emits vibration signals for alarming when a thief opens or cuts the pocket, money and articles in the pocket are taken out, or a plug is disengaged from the socket, the utility model has small size, is easy to hide in a user's body, is not influenced by environment and noise, and can detect effectively the vibration signals for alarming.