Automatic salinity adjusting system

The invention discloses an automatic salinity adjusting system which comprises a culturing container which internally contains saline water that can be used for culturing aquatic organisms, a water storage tank which is fixed above the culturing container, internally contains water and is provided with a first drain valve at the bottom, a salt storage tank which is fixed above the culturing container, internally contains salt water and is provided with a second drain valve at the bottom, a salinity meter and a control unit; the concentration of salt water in the salt storage tank is higher than that in the culturing container; the salinity meter is fixed in the culturing container, the salinity meter can detect the concentration of the saline water, and the detection end of the salinity meter extends below the liquid level in the culturing container; and the control unit is electrically connected with the salinity meter, the first drain valve and the second drain valve, and the control unit can receive feedba