Water circulation system and method thereof capable of achieving energy saving and increased efficiency in supplying oxygen to aquatic organisms, contributing to water resource conservation

The present invention provides a water circulation system for use in aquatic organism farming areas. The water circulation system comprises: a nano-bubble generator including a water inlet, an air inlet, and a water outlet, wherein the water inlet and water outlet are in liquid connection with the aquatic organism farming area; a pumping device; an air pressure gauge connected to the air inlet to output an air pressure signal; a liquid pressure gauge connected to the water inlet to output a water pressure signal; a control device that receives the air pressure signal and the water pressure signal and includes a timer and a microprocessor for setting the timer and generating a first control signal and a second control signal based on the timer, the air pressure signal, and the water pressure signal; an air valve connected to the air inlet for receiving the first control signal to control the status of the air inflow; and a liquid valve connected to the water inlet for receiving the second control signal to con