The present invention relates to a water supply device for a flowerpot and, more specifically, to a water supply device for a flowerpot, capable of facilitating the supply of water from a water container to the flowerpot by installing the water container storing water on a support housing which is installed on the flowerpot. To achieve the said purpose, the water supply device for a flowerpot includes: a water container which has an openable cap unit on the upper part thereof, a storage space inside thereof, and a discharge valve unit for selectively discharging stored water to outside； a support plate which is installed on the upper part of the flowerpot, is combined to the water container to support the water container, and receives water from the water container by opening the discharge valve unit when combined with the water container； and a water supply pipe which is connected to an outlet of a recess unit formed on the middle part of the support plate to supply water from the support housing to the flowerpot. The water container includes the openable cap unit to receive water from outside, and the selectively openable discharge valve unit on the bottom of a protrusion which protrudes downwards and is formed on the lower middle part of the water container. The discharge valve unit includes an opening and closing door for selectively opening and closing through-holes with a specific size formed on the bottom of the protrusion； a spring unit which is combined to the upper part of the opening door and presses the opening door downwards； and a support which is installed straight on the bottom of the protrusion spaced from the through-holes to a predetermined interval, and supports a spring unit.본 발명은 화분용 급수장치에 관한 것으로서 더욱 상세하게는 물이 저장되는 급수통을 화분의 상부측에 설치된 지지하우징에 장착하는 것으로 급수통의 물이 화분으로 원활하고 용이하게 급수되도록 하는 화분용 급수장치에 관한 것이다. 이를 위해 본 발명은 상부측에 개폐가능한 캡부를 가지며 내부에 일정 수용공간이 형성되고 하부측에 내부에 저장되는 물을 선택적으로 외부로 배출하는 배출밸브부가 형성되는 급수통과； 화분의 상부측에 설치되며 상부측으로 상기 급수통과 결합되어 급수통을 지지하며 급수통과 결
