A gravity fertilizer irrigation system, suitable for crop irrigation fertilization and includes a support unit, a water storage unit, a transportation unit, and an irrigation unit. The support unit is provided above the crops, and comprising a main irrigation seat and a plurality of subframe. The water storage unit is provided in the main irrigation seat, and includes a water storage tank around defining an accommodating space. The transportation unit comprises a main delivery pipe, and the plurality of sub-delivery pipe connected to the main delivery pipe. The irrigation unit connected with the transportation unit, and includes a plurality of drip jar, which is provided corresponding to the above crops.一種重力式肥灌系統,適用於對複數農作物以液體進行施肥灌溉,並包含一支架單元、一儲水單元、一輸送單元,及一灌溉單元。該支架單元設置於該複數農作物上方,並包括一主灌溉座,及複數連接該主灌溉座的副支架,該儲水單元設置於該主灌溉座上,並包括一圍繞界定出一容置空間之蓄水箱,該輸送單元包括一與該蓄水箱連接且設置於該支架單元上之主輸送管,及複數與該主輸送管相連通並對應設置於該複數副支架上之副輸送管,該灌溉單元與該輸送單元連接,並包括複數與該複數副輸送管連接之滴液罐,每一滴液罐是對應設置於該農作物上方。3‧‧‧農作物5‧‧‧支架單元51‧‧‧主灌溉座6‧‧‧儲水單元61‧‧‧蓄水箱7‧‧‧輸送單元71‧‧‧主輸送管72‧‧‧副輸送管723‧‧‧觀測視窗73‧‧‧分流開關8‧‧‧灌溉單元81‧‧‧滴液罐92‧‧‧第二排氣管
