The present invention relates to a health-abnormal condition alarm system using a multi bio-signal comprising: a wearable device which is configured to be worn on a users body and senses the multi bio-signal and a mobile communication terminal receiving a brainwave signal, a heartbeat signal, and a body temperature signal transmitted from the wearable device through a first communications network. The wearable device comprises a headset body, a plurality of electrodes, a brainwave detection unit, a heartbeat detection module, a body temperature detection unit, a headset wireless communication unit, and a headset controller. A health check application is installed in the mobile communication terminal, checks whether the users health is abnormal or not based on the brainwave signal, the heartbeat signal, and the body temperature signal, and transmits a health-abnormal alarm to a previously-registered external device through a second communications network when the users health condition is determined as abnormal. Accordingly, a health-abnormal condition alarm system using a multi bio-signal is provided which detects a brainwave, a heartbeat, and a body temperature of a user by using one wearable device, and which transmits an alarm to the outside when a health-abnormal condition of an observed person such as the old and the infirm is appeared by using the detected information, such that can more efficiently manage an emergency or a presymptom of the old and the infirm, etc.
