The invention relates to the technical field of underground nuclear power plants, and discloses a double-reactor T-shaped nuclear power plant group integrally provided with a low-intermediate-level waste disposal field. The plant group comprises a disposal field, two reactor plant cavities and a combined plant cavity; the combined plant cavity comprises a safety plant, a fuel plant, a safety plantand a nuclear auxiliary plant which are sequentially arranged from outside to inside along the space of the underground cavity; the disposal field communicates with the nuclear auxiliary plant; eachof the reactor plant cavities is connected with an electric plant cavity and a pressure relief cavity; the reactor plant cavities, the electric plant cavities and the pressure relief cavity are all indouble-reactor T-shaped mirror arrangement with the axes of the combined plant cavity as a center; and the reactor plant cavities are both connected with fuel plant, the safety plants and the nuclearauxiliary plant. According to the double-reactor T-shaped nuclear power plant group integrally provided with the low-intermediate-level waste disposal field, the whole excavation amount of underground cavities is reduced, the problem of disposal of low-intermediate-level wastes after operation and decommissioning of nuclear power plants is solved, and whole economy is improved.