The invention relates to the technical field of water quality detection, in particular to a detection device that can quantitatively detect water of different depths, comprising a detection frame, a bracket is installed at the bottom of the detection frame, the detection frame and the bracket are fixed by bolts, and the detection frame A scale is installed on the top of the test frame, the detection frame and the scale are fixed by bolts, a cylinder is installed inside the detection frame, and an arc-shaped plate is installed inside the cylinder, and the arc-shaped plate is slidably connected to the circular Inside the cylinder, a mounting plate is installed inside the arc-shaped plate, the mounting plate is welded with the cylinder, and a collecting cylinder is installed on the top of the mounting plate. The present invention has a reasonable design and an ingenious structure. With the cooperation, the detection is more convenient, it can be sampled multiple times, and it can quantitatively detect water of different depths, making the samples more common, making the samples tested are not universal, and have good market competitiveness, which is worth recommending.