Online concentration analyzer

The utility model relates to an online concentration analyzer. The online concentration analyzer comprises a measured medium pipeline connected with a measuring tank, wherein a light source emitting device and a signal receiving device are symmetrically and horizontally arranged in the middle of the measured medium pipeline; windows are arranged in the middle of the measured medium pipeline, so that light source signals are received by the signal receiving device; and the light source emitting device and the signal receiving device are connected with a transmitter through cables respectively. According to the online concentration analyzer, the measuring tank is directly mounted on the pipeline through flanges, so that a pretreatment device is omitted, the response time of the analyzer is prolonged, the measuring is timelier and more accurate, the cost of the analyzer is reduced, the maintenance degree and the maintenance difficulty of the analyzer are reduced, the online calibration maintenance can be realize