The utility model discloses a water pipeling PH measuring device structure for the stator cooling water system of generator auxiliary engine uses. Water pipeling PH measuring device's structure includes the relief pressure valve, flowmeter, PH meter, screwed joint, stainless steel pipe. According to the direction of rivers, count the series connection with relief pressure valve, flowmeter, PH in proper order to use screwed joint and stainless steel pipe to fix into the route, the circulation of the water of being convenient for. Need carefully select the screwed joint of suitable specification when the tube coupling to ensure that screwed joint can count correct accordant connection with relief pressure valve, flowmeter, PH.