The embodiment of the invention discloses an oblique photography building model monomerization method and device based on point density projection, a storage medium and electronic equipment. The method comprises the steps: carrying out the planar projection of a building point cloud model obtained through oblique photography, obtaining a density projection drawing, carrying out the gray thresholdfiltering and morphological expansion of the density projection drawing, and obtaining a gray threshold value of the density projection drawing; obtaining a building facade orthographic projection area, carrying out connected component analysis on the building facade orthographic projection area by utilizing a two pass algorithm, segmenting connected components containing each single building, calculating a minimum bounding box for each connected component, and carrying out contour modeling and block merging to obtain a single building image; and taking the single building image as a mask, reserving points falling in the foreground when the point cloud is projected to the image, extracting the single building point cloud, and completing the monomerization. By adopting the embodiment of theinvention, the oblique photography building model monomerization device automatically extracts each single building from the building point cloud model, and the efficiency is improved.