The present invention is a method for optimal control of an open space surrounding building form based on sky view evaluation. The method includes the following steps: vectorizing an existing planning scheme, and establishing a 3D model; classifying open spaces in the model, 360°-scanning for mean elevations, calculating and simulating sky views of a whole region, generating a 3D contour plot, and rasterizing the 3D isogram, such that each grid has an open space classification attribute and a sky view value; performing optimal adjustment of the building form on an open space surrounding region having a sky view value that is inconsistent with a corresponding preset sky view index within the range of the whole region, and bringing an adjusted scheme into the model for calculation again, till the sky view value is consistent with the corresponding preset sky view index.