Building waterproof leaking stoppage method

The invention relates to the technical field of building construction, and provides a building waterproof leaking stoppage method for the problem that cracks are formed again. According to the technical scheme, the building waterproof leaking stoppage method comprises the following steps that steel bar detection is carried out; a hole is enlarged; formworks are built; vacuum is pumped in a leakingstoppage hole; waterproof material is injected through high pressure, and constant pressure standing is carried out; the high temperature melt-like waterproof material is injected into the leaking stoppage hole until the injected pressure reaches 1MPa, and then constant pressure standing is carried out for 1h; decompression and cooling are carried out; and the formworks are removed. The waterproof material is injected through the high pressure and constant pressure standing is carried out, the waterproof material penetrates into the side wall to the leaking stoppage hole by using the high pressure, so that the contac