Soil sampling device

The utility model belongs to the technical field of cofferdam construction, and discloses a soil sampling device, which is used for extracting soil in buildings such as cofferdams and open caissons in a deepwater environment and comprises a flow guide pipe, an air bag sleeve and an air supply component. The flow guide pipe comprises a pumping-in end and a pumping-out end; the air bag sleeve is arranged on the peripheral side of the flow guide pipe in a sleeving mode, an air bag cavity can be defined between the inner wall of the air bag sleeve and the outer wall of the flow guide pipe, and the air bag cavity is communicated with the flow guide pipe; the air supply assembly is configured to be capable of feeding air into the air bag cavity, the air can flow through the flow guide pipe and be discharged through the extraction end so that negative pressure can be formed in the flow guide pipe, and the soil body can enter from the suction end along with the pressure and be discharged from the extraction end. The