The utility model relates to a raster type water gauge of high measurement precision and strong reliability, which comprises a fixing bracket, a driving wheel arranged on the fixing bracket, and a driven wheel connected with the driving wheel by a conveyor belt, wherein the driving wheel is driven by a motor; an elastic steel strip is arranged on the conveyor belt by a connecting press sheet; a measurement needle is arranged on the elastic steel strip; one head of the elastic steel strip penetrates through a guide sheet arranged on the fixing bracket; the connecting press sheet is connected with a raster probe which is arranged on a raster ruler body; the connecting press sheet is connected with a moving block which is arranged on a guide rail in a sliding manner rolling balls. The utility model has the advantages of flexible operation and high measurement precision, avoids the loss brought by the frequent actions of the existing water gauge and solves the problem of unreliable operation of instruments of various water gauges because of mechanical abrasion.