The invention discloses an underground fluid laminated sampling device based on a U-shaped
pipe technology. The underground fluid laminated sampling device comprises an underground fluid sample injection subsystem, a packer subsystem, a chaining subsystem, a ground sampling subsystem and a
soil gas sampling subsystem, wherein the underground fluid sample injection subsystem comprises a driving
pipe, a sample discharging
pipe, a fluid storage container, a
liquid phase check valve and a filtering element; the
soil gas sampling subsystem comprises a
gas phase check valve arranged at a set position; the
gas phase check valve is connected with a manual pump through a pneumatic
ball valve and a gas sampling bag. The invention further discloses an underground fluid laminated sampling method based on the U-shaped pipe technology. The underground fluid laminated sampling device is novel in structural design; multiple technical difficulties are overcome; compared with a product of the original technology, the underground fluid laminated sampling device has the advantages that the working performance, the application range and the
system stability are greatly improved, has higher competitiveness and industrial leading superiority, can be widely applied, is good in
engineering demand, and has good application prospect and commercial value.