The present invention relates to an integrated composite valve equipped with an overpressure prevention function, and more particularly, it is made of a simple structure in which an overpressure prevention part is integrally provided in a drain valve, so that it is easy to manufacture and maintain, and from the main pipe by the overpressure prevention part. When the pressure in the fire extinguishing pipe receiving the supplied fire extinguishing water rises above the set pressure, the fire extinguishing water from the fire extinguishing pipe is automatically discharged to maintain a constant pressure. It relates to an integrated composite valve equipped with an overpressure prevention function to prevent damage. The present invention is an integrated composite valve equipped with an overpressure prevention function installed in an alarm valve, in which one side is installed on the connection pipe of the alarm valve, the other side is provided with a drain valve and an installation hole formed on one side of the drain valve. It is characterized in that it comprises an overpressure prevention unit that is installed and automatically opened when the pressure of the fire extinguishing pipe of the alarm valve is higher than a preset pressure, and a discharge passage formed between the overpressure prevention unit and the drain port.
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