An automatic plant watering device is used to solve the problem that the conventional automatic watering device has a complicated structure and is easy to malfunction. It includes: a base with a watering element, the watering element pivots movably according to a pivoting portion, the first end of the watering element has a receiving groove, and the second end of the watering element has at least one counterweight A liquid storage tank, set on the base, a plate body divides the liquid storage tank into a liquid storage space and a flow control groove, the plate body has at least one long tube and at least one short tube, the long tube and The short tube communicates with the liquid storage space and the flow control tank, an opening is formed on the side surface of the liquid storage tank and communicates with the flow control tank； and an infusion part has an absorption end and a free end, The absorption end is located in the flow control tank, and the free end is located outside the liquid storage tank and is located in the receiving tank.一種植物自動澆水器，用以解決習知自動澆水器構造複雜且容易故障的問題。係包含：一底座，具有一澆灌件，該澆灌件依一樞接部活動地樞轉，該澆灌件的第一端具有一盛接槽，該澆灌件的第二端具有至少一配重塊；一儲液槽，設於該底座，一板體將該儲液槽內區分為一儲液空間及一流量控制槽，該板體具有至少一長管及至少一短管，該長管及該短管分別連通該儲液空間及該流量控制槽，一開孔形成於該儲液槽的側表面且與該流量控制槽相連通；及一輸液件，具有一吸收端及一自由端，該吸收端位於該流量控制槽中，該自由端位於該儲液槽外並對位於該盛接槽。
