The invention relates to high-reliability water quality monitoring equipment having an impurity removal function. The equipment includes a main body, an elevating device, a sampling chamber, a water pumping device, a detecting chamber, a detecting device, an impurity removal mechanism and a cleaning mechanism; the impurity removal mechanism includes a filter screen, an enclosed plate, a supportingshaft, a driving assembly and a fixing assembly; the driving assembly includes a first motor, a wire reel, a stay wire, a slide block, a fixing plate, an adjusting rod and a spring; the cleaning mechanism includes a clear water tank, a communicating pipe, a rotary box, two power assemblies and two cleaning assemblies; and the cleaning assemblies includes a connecting pipe and multiple nozzles. Through the cleaning mechanism, cleaning work can be performed on the inner wall of the detecting chamber and the detecting device, so that impurities can be prevented from covering on the detecting device to affect the detection effects of next sampling water, and therefore, the reliability of the equipment can be enhanced; and through the impurity removal mechanism, creatures in the water can be prevented from entering the detecting chamber to affect the detection effects.