Device for cultivating hydroponic plants

Disclosed is a device for cultivating hydroponic plants. The device comprises a nutrient solution holding disc for holding a nutrient solution, a plurality of first protruding portions and a plurality of second protruding portions. The nutrient solution holding disc at least comprises a first long side wall and a second long side wall which are opposite. The plurality of the first protruding portions are contacted with the first long side wall respectively and not contacted with the second long side wall to form first openings respectively. The plurality of the second protruding portions are contacted with the second long side wall respectively and not contacted with the first long side wall to form second openings respectively. The plurality of the first protruding portions and the plurality of the second protruding portions are arranged at intervals, and extending directions of the plurality of the first protruding portions and the plurality of the second protruding portions are vertical to the injection direction of the nutrient solution.