Assembly, method and tool for rebuilding underground water well into underground water circulating well

The invention discloses an assembly, method and tool for rebuilding an underground water well into an underground water circulating well, the assembly comprises an inner pipe, a sealing plate, an aeration pipe, an exhaust pipe, a waterproof ring and a supporting piece, the inner pipe can be placed below the underground water level in an underground water monitoring well to be rebuilt, and the supporting piece is arranged at the bottom of the inner pipe; the periphery of the upper portion of the inner pipe is sleeved with a waterproof ring capable of filling a gap between the inner pipe and the monitoring well, the exhaust pipe and the aeration pipe are arranged on the sealing plate in a penetrating mode, and when the sealing plate is installed at a wellhead of the underground water monitoring well to be reconstructed, the lower end of the aeration pipe is arranged in underground water, and the lower end of the exhaust pipe is located above the inner pipe. After the volatile organic pollution condition is foun