The present invention relates to an IoT-based farm energy saving system. In the present invention, the configuration is installed on one side of a farm or fishing environment to observe water temperature, dissolved oxygen, salinity, Ph, and turbidity that are closely related to growth based on information on temperature, wind speed, wind direction, humidity, and rainfall in a designated sea area. , Water level measurement of seawater tank, operation of driving pump for seawater supply and supply of liquefied oxygen, predicting the pump operation rate and growth environment, deriving the appropriate pump operation rate and checking the correlation between the oxygen dose, and predicting the growth environment according to the pump operation rate. Aquaculture environment device that provides growth information and growth environment information of aquaculture farm and fishing environment； The aquaculture environment device calculates the amount of oxygen required in the water tank based on the data on the culture growth environment, controls the liquefied oxygen nozzle to control the amount of oxygen supplied to supply appropriate oxygen in the water tank, or classifies available or non-available pumps to reduce power or schedule power reduction. Smart control device for controlling the pump inverter inverter according to the command, or controlling the intelligent pump in consideration of the growth environment of the flat body and the density farm； Provides a solution for farm management through historical management according to the demand resources of the farm environment device, the maximum amount of savings possible by considering the external weather and water temperature, creating an optimal pump control schedule according to the savings required, and managing and calculating demand response resources. A demand resource management device； By driving a dedicated application, the status of the farm environment information is monitored according to the farm envir
