Discloses is a method for building urban underground tunnel shield cutter repairing space with preset reinforcing pile groups. A rectangular vertical shaft (1) and a transverse tunnel (4) are built additionally to avoid important underground pipelines (3) or underground buildings (2). Three rows of glass fiber reinforced concrete piles of the same pore diameters are constructed in parallel on a cross section of a to-be-excavated tunnel through the transverse tunnel, namely a first row of glass fiber reinforced concrete piles (8), a second row of glass fiber reinforced concrete piles (7) and a third row of glass fiber reinforced concrete piles (9). The tops of the glass fiber reinforced concrete piles are connected through a reinforced concrete cover plate (5) to form the preset reinforcing pile groups. When a shield (10) is excavated to the first row of glass fiber reinforced concrete piles and cuts the same, and a cutter (11) repairing space (6) is built on the second row of glass fiber reinforced concrete piles. By the repairing space, possibility for repairing the shield cutter is provided, cutter repairing time is shortened, and normal construction of shield is guaranteed.