Multifunctional water-flooded culture device and operation method

The invention relates to a multifunctional water-flooded culture device and an operation method thereof, which are used for simulating the water-flooded environment of aquatic plants. The device comprises an outer barrel, an inner barrel, a supporting unit, a liquid level marking unit and a water inlet and drainage unit, wherein the inner barrel is of a hollow structure with an top opening and thelower part of the inner barrel is arranged in an inner cavity of the outer barrel, the top of the outer barrel and the outer wall of the inner barrel are well sealed, sand and soil are arranged in the inner cavity of the inner barrel, a lower plate is detachably arranged in the inner cavity of the inner barrel, the top of the lower plate is fixedly connected with a straight rod, a floating ball is slidably arranged on the straight rod, the straight rod, the lower plate and the floating ball form the liquid level marking unit, and a scale mark is arranged on the outer wall of the inner barrel;a through hole is formed