The pre-action alarm valve group is a fixed fire prevention system that can provide early fire alarm and automatic fire suppression. The fire detection section can promptly issue a fire alarm and then open the deluge valve. Pressurized water quickly fills the pipeline network. When the temperature continues to rise, the sprinkler heads start to spray water. This system overcomes the shortcomings of wet and dry systems, combines the advantages of both, and has the characteristics of early alarm, fast spraying, full functionality, and wide applicability. It can emit a fire alarm before the sprinkler heads start spraying water, allowing places that are generally not allowed to use water, such as high valuable item storage areas, rare book libraries, archives, computer rooms, etc. to adopt this fire suppression system. Many fires have been dealt with by on-duty personnel before the sprinkler heads are activated, avoiding large areas of water damage.