Underground deep water quality monitoring and sampling device and operation method thereof

The invention discloses an underground deep water quality monitoring and sampling device which comprises a sampling support, a downward drilling mechanism is arranged at the upper end of the sampling support, a fixing device is arranged at the upper end of the downward drilling mechanism, a positioning mechanism is arranged at the lower end of the sampling support, and a sampling mechanism is arranged on the fixing device. The sampling mechanism is installed between the drilling mechanism and the fixing device, the drilling mechanism comprises a drilling bit and a drilling pipe, a rotating structure is arranged above the drilling bit, the rotating structure is arranged in the drilling pipe, the drilling bit is connected to the lower end of the drilling pipe, the fixing device comprises a fixing frame, and the fixing frame is connected with the drilling mechanism. Four assemblies are arranged on the fixing frame, monitoring and sampling of deep underground water quality can be stably carried out through the sa