Agricultural nutrient solution supply device according to the present invention is an agricultural nutrient solution supply device consisting of supplying the nutrient solution to the crop by mixing the raw water and a number of fertilizer liquid, nutrient solution that automatically mixed the raw water and a large number of fertilizer liquid Is stored in the automatic feeder for supplying the nutrient solution in the nutrient solution to the crop in accordance with the type and time of the crop, and the manual feeder connected to the nutrient solution in the nutrient solution to supply the crop manually； The manual feeder is connected to an automatic pump to a nutrient solution container, a hose is connected to an outlet of the automatic pump, and a nutrient solution injection port having a valve for controlling the hose is connected to an end of the hose, and between the outlet of the automatic pump and the hose. The first filter is configured to filter foreign matter in the nutrient solution, the automatic feeder is provided with a second filter at the outlet of the raw water supply pump, the flow rate sensor for detecting the supply flow rate of the raw water is the outlet of the second filter Raw water conveyed by the raw water supply pump is supplied to the nutrient solution container through the second filter and the flow sensor, and a third filter is installed at the outlet of the nutrient solution supply pump for transporting the nutrient solution in the lower part of the nutrient solution container. The first return pipe is installed in one of the two branch outlets formed in the third filter, the nutrient solution conveyed by the nutrient solution mixed supply pump A plurality of fertilizer liquid conveying pipes returning to the container and transferring a plurality of fertilizer liquids to the nutrient solution container are connected to the nutrient solution container while communicating with the first return pipe, and orifices and solenoid valves are
