PROBLEM TO BE SOLVED: To improve the work efficiency of aquatic plants when removing the aquatic plants from the bottom of a lake, so as not to obscure the field of view of a worker who dives by diving so that the water does not become muddy. Provide a removing device and a method for removing aquatic plants. SOLUTION: Compressed high-pressure air from an air supply source 2 is introduced through an air supply hose 3 and an air supply cylinder 12 from a communication port 16 between a vertical cylinder 10 and a water outlet member 17, Ascends along the ascending path UP, and further ascends in the vertical cylindrical portion 10. Along with the rise of the high-pressure air, a vigorous water flow was formed in the vertical tubular portion 10, and the water WA of the lake was guided from the suction port 11K into the vertical tubular portion 10 via the horizontal tubular portion 11, and the water was narrowed. The water outflow member 17 enables an efficient and quick water flow, and the suction from the suction port 11K becomes strong, and the suction port 11K sucks the portion near the root of the stem of the waterweed WP from the horizontal direction and bends the stem. Inhale and pull out. [Selection diagram] Figure 1【課題】湖沼の底から水草を除去する際に、水が濁らないようにして潜水して除草作業を行う作業員の視界を妨げないようにし、水草の作業効率の向上を図ることができる水草除去装置及び水草除去方法の提供。【解決手段】エアー供給源２からの圧縮された高圧空気はエアー供給ホース３、エアー供給筒部１２を介して連通口１６から垂直筒部１０と水流出部材１７との間に導入され、エアー上昇通路ＵＰに沿って上昇し、更に垂直筒部１０内を上昇する。高圧空気の上昇に伴い、垂直筒部１０内に勢いのよい水流ができ、吸込み口１１Ｋから湖沼の水ＷＡは水平筒部１１を経て垂直筒部１０内へと導かれ、水は狭められた水流出部材１７により効率の良い早い水流ができて、吸込み口１１Ｋからの吸込みも強くなって、吸込み口１１Ｋは水草ＷＰの茎の根元に近い部分を水平方向から吸い込み、茎を折り曲げるようにしながら吸い込んで引き抜くことになる。【選択図】図１
