Sewage and rainwater COD (Chemical Oxygen Demand) online monitor

The utility model relates to the technical field of monitors, in particular to a sewage and rainwater COD (Chemical Oxygen Demand) online monitor which comprises a monitoring box, a box door is connected to the front side of the monitoring box, a touch screen is arranged at the upper part in the monitoring box, a xenon lamp is arranged in the middle in the monitoring box, and a plurality of groups of second interfaces are arranged at the lower end in the monitoring box. Multiple groups of first interfaces are arranged at the lower part of the front surface of the monitoring box, a mounting frame is arranged at the upper part of the back surface of the monitoring box, a clear water tank is arranged in the mounting frame, water pumps are arranged in the middle and the lower part of the back surface of the monitoring box, multiple groups of water inlets are formed in the back surface of the monitoring box close to the middle of the two groups of water pumps, and water paths are connected to the water inlets; the