Device for fluidly injecting and rapidly analyzing residual chlorine of water quality and analysis method thereof

The invention discloses a device for fluidly injecting and rapidly analyzing residual chlorine of water quality and an analysis method thereof. The device comprises a photoelectric flow cell, a reacting tube, an indicator liquid storage vase, a current-carrying liquid storage vase, a first peristaltic pump, a current-carrying liquid injection pump, a second peristaltic pump, a current-carrying liquid three-way valve, a first sampling six-way valve, a second sampling six-way valve, a capillary tube, a sampling capillary tube, a first guide sample source, a second guide sample source, a first electromagnetic valve and a second electromagnetic valve, wherein the first electromagnetic valve and the second electromagnetic valve are switched with a water sample source. In the invention, the sampling capillary tube with a fixed length is adopted, the water sample ration is accurate, the dispersed state of the sample in the current-carrying liquid has high repeatability in a certain retained time, the measurement result is accurate, and the flow path is simple, thereby being easy for realizing automation, real-time and on-line monitoring and low failure rate. The invention can be used for on-line monitoring of the residual chlorine in drinking water and industrial recirculating cooling water, conveniently and rapidly obtaining real-time analysis data, and especially finding, reporting and handling water pollution accidents with serious idiopathic.