Switching device for flow cell

The utility model relates to the technical field of flow cells, in particular to a switching device for a flow cell. The switching device for the flow cell comprises a liquid supply pipe, the liquid supply pipe is connected with a reducer pipe through Y-shaped filters which are arranged in parallel, one end of the reducer pipe is connected with a reducing adapter, one end of the reducing adapter is connected with a first pneumatic quick connecting plug, and one end of the first pneumatic quick connecting plug is connected with a PVC hose in an inserted mode. One end of the PVC hose is in inserted connection with the second pneumatic quick connector, and one end of the second pneumatic quick connector is connected with the flow cell connecting pipe. The flow cell and the liquid supply pipe are tightly connected, the sealing performance is good, water to be measured can continuously flow into the flow cell for a long time, impurities in the water can be filtered out, and the dissolved oxygen tester can rapidly,