Underground water sampling device convenient for detecting different depths

The utility model discloses an underground water sampling device convenient for detecting different depths, and relates to the technical field of underground water detection. The limiting assembly is fixed at the opening in the bottom of the outer cylinder and upwards penetrates through the outer cylinder; the multiple water storage tank assemblies are located in the outer cylinder, and the lower surface of the lowest water storage tank assembly makes contact with the limiting assembly; the multiple plugging devices correspond to the water storage tank assemblies in a one-to-one mode, the top openings of the water storage tank assemblies are detachably sleeved with the plugging devices, and the overall weight of the plugging devices is larger than that of the water storage tank assemblies; according to the utility model, through the arrangement of the first pull rope, the plurality of water storage tank assemblies can descend to water levels of different depths, so that the water storage tank assemblies can s