The utility model discloses an underground water ammonia-nitrogen in-situ reinforcement nitration and denitrification integration system. The integration system comprises an in-situ ammonia-nitrogen reinforcement nitration system, an in-situ nitrate-nitrogen reinforcement denitrification system and an aeration zone in-situ solution monitoring device, wherein the in-situ ammonia-nitrogen reinforcement nitration system comprises a first operation well closely adjacent to solid waste in an aeration zone and water distribution pipes extending to the position below the solid waste to moisturize the portion, below the solid waste, of the aeration zone; the in-situ nitrate-nitrogen reinforcement denitrification system comprises a pumping well, a static mixer and a water injection well, the pumping well and the water injection well are both arranged in an underground water nitrate-nitrogen pollution area surrounding the solid waste, and underground water and carbon source agents are injected into the water injection well after being uniformly mixed in the static mixer; the aeration zone in-situ solution monitoring device comprises a pump and at least one solution collection pipe arranged in the aeration zone. The technical scheme of the underground water ammonia-nitrogen in-situ reinforcement nitration and denitrification integration system has a very good underground water pollution restoration effect and can effectively improve the severe situation of water pollution in China.