The utility model belongs to the technical field of marine observation, and particularly relates to a marine carbon dioxide online monitoring system based on electrochemical sensing. Wherein the pH and salinity circulating pool, the electrode circulating pool, the flow path system and the control system are arranged in the cabin body; a pH and salinity monitoring assembly is inserted into the pH and salinity circulating pool and is used for monitoring the pH value and salinity of the ocean; an electrode assembly is inserted into the electrode flow cell, and the concentration of carbonate ionsin the sea is monitored through the electrode assembly; the flow path system is used for providing seawater or a calibration solution for the pH and salinity flow cell and the electrode flow cell; thecontrol system is used for controlling the flow path system. The device is low in sample demand quantity and simple to operate, and the precision and the stability can meet the monitoring indexes.
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