The invention provides a spray and dust reduction guard bar used for civil engineering construction, and relates to the technical field of civil engineering. The guard bar comprises a water pipe connecting device and a spray and dust reduction guard bar body; the water pipe connecting device is buried under the ground and comprises a master water pipe, a vertical tube is fixedly connected to the top end of the master water pipe, a transverse tube is fixed to the top end of the vertical tube and communicated with the vertical tube, one end of the transverse tube is fixedly connected with a connecting hose, and the other end of the connecting hose penetrates out of the earth surface; the spray and dust reduction guard bar body is fixedly arranged on the earth surface and comprises two bases,supporting tubes are fixed to the two bases respectively, and an upper transverse tube and a lower transverse tube are fixed between the two supporting tubes; multiple stop levers are perpendicularlyfixed between the upper transverse tube and the lower transverse tube, spraying heads are fixed to the top ends of the two supporting tubes respectively, and a water inlet pipe and a first pull rod are fixed to the bottom end of the lower transverse tube. The spray and dust reduction guard bar used for civil engineering construction can prevent water from blowing out from the connecting positionof the water inlet pipe and the connecting hose, and a lot of water resources are prevented from being wasted effectively.