A kind of sprinkler of cistern capable of regulating drainage rate,Include a sprinkler main body,One spiral cover and a water yield indicating unit； The sprinkler main body to containing liquid,With the first several apopores,The spiral cover tying is closed in the what sprinkler main body,With the second several apopores,The spiral cover can simultaneously be rotated in place by external force,The water yield indicating unit has one first instruction unit and one second instruction unit,The first instruction unit system sets in the what sprinkler main body,And position is at the position of the adjacent spiral cover,The second instruction unit system sets on the what spiral cover,And position is at the position of the adjacent sprinkler main body,To indicate the big small person of water yield by the corresponding position between the first instruction unit and the second instruction unit； Use reach can advantageously and accurately water yield adjusting the effect of.一種可調節出水量之澆水器，包含有一澆水器主體、一旋蓋及一出水量指示單元；該澆水器主體用以容裝液體，具有若干之第一出水孔，該旋蓋係結合於該澆水器主體上，具有若干之第二出水孔，該旋蓋並可受外力作用而進行原地旋轉，該出水量指示單元具有一第一指示部及一第二指示部，該第一指示部係設於該澆水器主體上，並位在鄰接該旋蓋之位置處，該第二指示部係設於該旋蓋上，並位在鄰接該澆水器主體之位置處，以藉由第一指示部與第二指示部間之對應位置而指示出水量之大小者；藉以達到能便利地及精確地調節出水量之功效。
