Sampling mechanism for detecting water quality in navigation engineering and fixing device of sampling mechanism

The utility model discloses a sampling mechanism for detecting water quality in navigation engineering and a fixing device thereof, the sampling mechanism comprises a bearing part and a fixing mechanism, and relates to the technical field of water quality detection, during use, a floating plate assembly and an extension plate float on the water surface by using a floating ball and a buoy, and the extension plate is mounted in a cross structure; the floating plate assembly is kept stable on the water surface through the extension plate and the base, the four water quality sensors arranged on the extension plate can be different, detection personnel can flexibly adjust and install the water quality sensors according to needs, water quality can be conveniently detected in all aspects, and the detection requirements of different people in different industries are met. When water pumping and sampling are needed, a water pump in a sealing box can be started to pump water into a water storage barrel for storage, and