Construction layout of underground nuclear power station nuclear island workshop underground grotto group vertical to depth direction of mountain body

The invention discloses a construction layout of an underground nuclear power station nuclear island workshop underground grotto group vertical to the depth direction of a mountain body. The construction layout comprises a nuclear reactor workshop grotto, two combination grottos, two electric workshop grottos, two pressure relief grottos, a branch access tunnel, a side access tunnel, a first main access tunnel, a second main access tunnel and a third main access tunnel, wherein the first main access tunnel, the second main access tunnel and the third main access tunnel are all communicated with the earth surface, the nuclear reactor workshop grotto, the combination grottos, the electric workshop grottos and the pressure relief grottos form a nuclear island workshop grotto group, crown arch springings or crown headwalls of the grottos of the nuclear island workshop grotto group are communicated with the earth surface through a top layer adit system, and side wall bottoms of the grottos of the nuclear island wo