Disclosed in the　present invention are an automatic color filling method and apparatus for a building general drawing. Said method comprises: acquiring plane general drawing data of a building, and performing analysis on the basis of preset building basic element features to obtain basic elements of a building general drawing; on the basis of basic element data, generating specific elements according to a preset corresponding policy between the specific elements and the basic elements; receiving and analyzing a color matching mode instruction, and according to corresponding color matching policies of the elements under a preset color matching mode, obtaining color matching schemes of the elements under the selected color matching mode; respectively selecting corresponding colors according to the color matching schemes, so as to perform color matching and filling on the basic elements and the specific elements; and processing, by using a selected picture format conversion policy, the building general drawing of which the color matching and filling has been completed, so as to obtain a color-filled building general drawing in a corresponding picture format. The present invention provides an efficient and highly-accurate solution of automatic color filling for a building general drawing.