Automatic water spraying fire extinguishing system

The invention relates to an automatic water spraying fire extinguishing system which comprises a spraying system, a pre-acting system and a water supply system, the pre-acting system comprises a diaphragm valve, a diaphragm control device, a hydraulic alarm device and a diaphragm cavity compensation valve, and a main water supply side channel communicated with the water supply system, a system side channel communicated with the spraying system and a diaphragm cavity are arranged in the diaphragm valve; the diaphragm control device is communicated with the diaphragm cavity, the diaphragm cavity compensation valve comprises a compensation valve body, a compensation valve element, a compensation valve diaphragm piece and a valve element cleaning device, and the interior of the compensation valve body is divided by the compensation valve element and the compensation valve diaphragm piece to form a water supply side connector channel, a diaphragm cavity connector channel and an alarm connector channel. A compensat