A plant cultivation monitoring system includes a plant cultivation tank, a nutrient solution tank, a detecting device, supplying tanks, a time controlling unit, a quantity controlling unit and a controlling device. The nutrient solution tank communicates with the plant cultivation tank, and accommodates a first liquid. The detecting device detects the first liquid and provides a data. The supplying tanks communicate with the nutrient solution, and accommodate a second liquid. The time controlling unit sets the timing points the supplying tanks supply the second liquid to the nutrient solution tank in a time unit. The quantity controlling unit sets the quantity of the second liquid the supplying tanks supply to the nutrient solution tank at the timing points according to the data. The controlling device controls the supplying tanks to supply the corresponding quantity of the second liquid to the nutrient solution tank at the timing points.一種植物栽培監控系統包含植物栽培槽、養液槽、檢測裝置、供應槽、時間控制單元、份量控制單元與控制裝置。植物栽培槽用以栽培植物。養液槽連通植物栽培槽，養液槽用以容置第一液體。檢測裝置用以檢測第一液體並提供數據。供應槽連通養液槽，並用以容置第二液體。時間控制單元用以設定供應槽在時間單位中分別供應第二液體至養液槽之時間點。份量控制單元用以根據數據設定供應槽在時間點供應第二液體至養液槽之份量。控制裝置用以控制供應槽在時間點供應對應之份量之第二液體至養液槽。
