The invention discloses a grading display method for GIS elements of a digital irrigation area. The method comprises the steps of obtaining water consumption information of all pieces of paddy field required to be subjected to grading display; calculating water conveying amount information of all channels; setting level information of all the channels and gates; combining the pieces of paddy field and setting level information of the pieces of paddy field; and organizing all the GIS elements with the same level into a graphic layer, wherein the level of the graphic layer is the same as that of the GIS elements. The grading display method has the following advantages: the characteristics of the irrigation area are met, the operability is high, a GIS of the digital irrigation area can be ensured to always display detail information with the level consistent with a current zoom level, the information expression is clear and effective, the display delay can be shortened, and the display speed can be increased.