Method for rebuilding row-by-row small-section buildings by fully utilizing old buildings

The invention relates to the technical field of construction measures for existing buildings, and discloses a method for rebuilding rows of small-section buildings by fully utilizing old buildings, in the method, door and window holes required to be formed for rebuilding old buildings are concentrated together to form vertical strip-shaped construction holes with lintels and embedded columns; the vertical bearing capacity is not influenced, the interference of the old building outer wall on the internal large change construction is overcome, after the interference is overcome, a set of new bearing wall can be implanted to bear the newly-added floor, and the problem caused by bearing the newly-added load only by the old bearing wall is avoided. The early-stage interference-free columns are implanted and form a stable three-dimensional beam column grid together with the frame beams, and after construction on the outer wall of the old building is completed, the early-stage interference-free columns are horizonta