Online urea clearance rate monitoring device

The utility model discloses an on-line urea clearance rate monitoring device, which comprises a monochromatic light source transmitting circuit, a monochromatic light source receiving circuit and a monochromatic light source transmitting circuit, the waste liquid storage device is used for storing dialysis urea waste liquid; the light source receiving device is used for receiving a transmission light source after the stable emission light source penetrates through the waste liquid storage device; a weak current signal is generated when the transmission light source is received; and the sampling processing circuit is used for converting, amplifying and sampling the weak current signal to obtain urea change monitoring data. Weak current generated after a monochromatic light source directly penetrates through a waste liquid storage device containing dialysis urea waste liquid of a hemodialysis patient is collected, sampling is conducted after the weak current is converted and amplified, cleaning monitoring data