The present invention can automatic water supply in place at the time of the short-term absence, is an all-weather robust lightly, to provide a siphon type automatic drip waterer for maintenance-free flowerpot. Create a drip incorporate what A was drilled several holes 3 of the small-diameter pipe in a sealed water intake box 2. Adjusting the flow rate for the water supply of the minimum required for the flowerpot, decide the number of holes that come out drip is rotated to the left and right by picking the pipe with a finger. Flowing from the water source of the water is automatically automatic water supply over a long period of time because it has adopted the principle of the siphon flowing in a tube about the capacity of the water source is large can be by atmospheric pressure.FIELD 1【課題】短期間留守をする時に代って自動給水が出来、軽くて堅牢で全天候型である、メンテナンスフリーの植木鉢用サイフォン式自動点滴給水器を提供する。【解決手段】パイプに微小径の孔3を数個開けたものを密封型取水箱2に組み込んで点滴を作りだす。植木鉢に必要な最低限度の給水をする為の流量の調整は、パイプを指で摘んで左右に回転させ点滴が出てくる孔の数で決める。水源からの通流は大気圧によって水が自動的にチューブの中を流れるサイフォン式の原理を採用していることから水源の容量が大きいほど長時間に亘り自動給水が出来る。【選択図】図1