An online turbidimeter is provided to suppress bubble generation inducing error in a measured value by forming the upper side of an overflow pipe to be inclined. An online turbidimeter comprises: a supply unit(10) in which the sample water of a purification plant is supplied through a supply pipe(13); a bubble removing unit(20) which is connected to the supply pipe, and removes bubble with a bubble removing cap(21) and an overflow pipe(22); a cell block unit(30) in which the sample water in which the bubble is removed is contained for measurement; a pair of sensor units(40) measuring turbidity of sample water; an amplifier(50) amplifying the signal of the measured turbidity value; and a controller(60) receiving the amplified signal and indicating the measured value by a digital method.
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