The invention discloses a double-side wedge-shaped cutting, tunneling and detonating method of an especially-big fracture surface tunnel. The to-be-excavated especially-big fracture surface tunnel is divided into an upper step and a lower step to be constructed; as for a to-be-excavated rock mass of the upper step of the tunnel, the double-side wedge-shaped cutting and subsection millisecond delay detonating method is used for excavation; according to double-side wedge-shaped cutting, double-side cutting zones are symmetrically distributed at the lower middle portions of the two sides of a face center line of the upper step, the cutting zones are vertical columnar zones with the plane shapes being wedge shapes, and groove cavities formed by cutting and detonating can provide sufficient smashing expansion space for detonating of various types of shot holes; and according to subsection millisecond delay, millisecond delay detonating is carried out at the positions between rows, detonating of various types of shot holes is carried out, the using rate of various types of shot holes is effectively improved, and the design footage is guaranteed.