The invention discloses a deformable open channel curve water channel device for a water flow silt experiment. A curve water channel is arranged in an experimental pool in the length direction, a water channel inlet is formed in one end of the curve water channel, a water channel outlet is formed in the other end of the curve water channel, silt is arranged in the curve water channel, the portion, on one side of the water channel inlet, of the experimental pool is connected with one end of a water conveying pipeline, a water outlet is formed in the portion, on one side of the water channel outlet, of the experimental pool, a water storage tank is arranged below the water outlet, a desilting basin and a water pump are arranged in the water storage box, an upper end opening of the desilting basin is lower than an upper end opening of the water storage tank, the drainage end of the water pump is connected with the other end of the water conveying pipeline, two rotation adjusting mechanisms which are identical in structure are arranged on the portion, on one side of the experimental pool, of the bottom of the experimental pool, and two height adjusting mechanisms which are identical in structure are arranged on the portion, on the other side of the experimental pool, of the bottom of the experimental pool. According to the deformable open channel curve water channel device for the water flow silt experiment, the form of a curve can be easily and conveniently changed, the purpose that parameters such as the width and the curvature of the water channel can be adjusted at will is achieved, and the experiment conditions of curve water and silt are greatly improved.