Air pressure type deep underground water stratified sampling device

The utility model relates to an air pressure type deep underground water stratified sampling device which comprises a sampling body, and a lifting mechanism and an air pressure control mechanism which are connected with the sampling body, the sampling body consists of an upper-section sampling device, a middle-section sampling device and a lower-section sampling device which are sequentially connected in a fastening manner, and the sampling body is of a cavity structure; annular air bags are fixedly sleeved at the upper end and the lower end of the sampling body, and the sampling body is fixed in the sampling hole by inflating the air bags. According to the underground water sampling device, underground water is sucked out of a stratum by adopting vacuum negative pressure, layered low-disturbance sampling of deep underground water and sampling of underground water with poor water content are well realized, and the size of the device can be flexibly adjusted according to the actual requirements of the aperture