The invention discloses a pile manufacturing method in buildings and belongs to the field of building construction. The pile manufacturing method includes the following steps: 1 pile hole drilling: adopting a drilling machine to drill a pile hole at a reserved point; 2 slurry pumping out: pumping out slurry remained in the pile hole; 3 fuel injecting: injecting fuel gas or fuel in the pile hole and filling in oxygen-containing gas; 4 roasting: igniting in the pile hole for roasting until the bottom of the pile hole and the peripheral wall tend to become bricks; 5 reinforcing steel bar framework sinking: sinking a reinforcing steel bar framework in the pile hole tending to become bricks and fixing the reinforcing steel bar framework; 6 concrete pouring; and 7 pile forming: forming a pile after the concrete is solidified. The pile manufacturing method is applied to pile manufacturing operation in pouring mode achieved by aid of a drilling well, a main pile close to a straight cylinder can be formed so as to enhance the strength of the main pile, the strength of a mud layer around the main pile can be enhanced, and accordingly the strength of a foundation is greatly enhanced.