The present invention relates to the field of the geographic information processing, and discloses a building vector boundary simplification method. The method comprises: obtaining a building vector polygon from a building vector diagram; determining the corner points of the vector polygon; determining a distance screening threshold according to the perimeter of the vector polygon or the distance between the corner points; and traversing all the boundary points of the vector polygon, comparing the distance between the traversed boundary points and the boundary points adjacent to the traversed boundary points with the distance screening threshold, and deleting the adjacent boundary points when the distance is smaller the distance screening threshold and the adjacent boundary points are not the corner points. According to the invention, the distance screening threshold is employed to get rid of the boundary points which do not meet the conditions, and therefore the building vector boundary simplification method is applicable to the building vector boundary simplification process and is simple in related calculating process.