The invention provides a water quality forecasting distribution map drawing method and device and electronic equipment in the technical field of graph drawing. The method comprises the steps of obtaining initial forecasting mode data of a target water body; converting the initial forecasting mode data of the target water body into triangular mesh data; determining a map position of the target water body on the map; on a map position, drawing a water quality forecasting distribution map of the target water body according to the triangular mesh data. The water quality distribution map can be directly drawn on the map through the triangular grid data, and the technical problem that in the prior art, a water quality forecast distribution map in a picture format is directly overlapped on the map, and consequently transmission, operation and other aspects of the map are inconvenient is solved.