The invention belongs to the technical field of unmanned aerial vehicles, especially a kind of unmanned aerial vehicle for collecting water samples. Aiming at the problems existing in the prior art, the following proposals are proposed, including the casing, the four corners of the casing are equipped with wings, and the four corners of the casing are equipped with wings. A controller is installed inside, a rack is installed on the bottom outer wall of the casing, and a collection cylinder is arranged under the casing, and the bottom surface of the collection cylinder is a spherical structure, the bottom inner wall of the collection cylinder is fixedly connected with an intermediate cylinder, and the side of the intermediate cylinder There are at least six annular partitions evenly distributed between the outer wall and the side inner wall of the collection cylinder, and a collection chamber is left between every two partitions. The side inner wall of the casing above the middle cylinder is provided with a The middle shell, and the inside of the middle shell is provided with a pressure-lifting mechanism. The invention prevents duckweed and other debris on the water surface from affecting the collection of water samples, and at the same time ensures that there are no large pieces of debris in the collected water samples, which facilitates subsequent cleaning.