The invention relates to the technical field of planning site generation, and particularly provides a weak coverage grid and problem building planning site generation method and device, and the method comprises the following steps: S1, the convergence of 4G or 5G grid data, and the convergence of 4G or 5G building data based on improved limited
DBSCAN clustering; s2, preprocessing the grid data and the building data, and deleting data with missing values in core fields in the grid data and the building data; s3, carrying out clustering on the 4G or 5G
raster data; s4, carrying out the clustering of the buildings of the property points of the 4G or 5G non-
residential area; s5, clustering the buildings of the property points of the 4G or 5G
residential area; s6, using a convex
hull algorithm to form envelopes for 4G / 5G building and 4G / 5G grid result data; and S7, evaluating the envelopes, and dividing the envelopes into effective envelopes, potential envelopes and discarded envelopes. Compared with the prior art, it can be ensured that the coverage distance and the upper limit of the number of board cards meet the service requirements, and the generated envelope more accurately contains weak coverage grids and problematic buildings.