A liquid supply device includes a base with a drinking trough. The drinking trough is provided with a ring wall, which is provided with a first threaded section along the height direction； the ring wall is provided with a notch extending in the height direction and connected to the inner side of the ring wall To the outside； the ring wall is screwed with a bottle body for holding liquid. The bottle body can change its relative position with the ring wall by threads, and switch the gap to close or open, thereby controlling the amount of liquid outflow.一種供液裝置，包括有一具有飲水槽之基座，此飲水槽中設有一環牆，其沿高度方向設有一第一螺紋段；環牆設有一沿高度方向延伸之缺口，連通環牆之內側與外側；環牆螺接有一用以盛裝液體之瓶體，此瓶體可藉由螺紋變化其與環牆之相對位置，並切換缺口封閉或開啟，進而控制液體流出的量。
