Negative pressure method and device for underground water stratified sampling

The invention discloses a negative pressure method and device for underground water stratified sampling. The sampling method comprises a control management program made and compiled by adopting a negative pressure principle, a negative pressure sampling probe, a vacuum pump, a ground control host and a cable winch. The control management program is installed in a ground host, and the main processcomprises parameter setting, probe sampling bottle vacuumizing, control of the probe from shallow to deep to reach different sampling depths, respective control of the probe for sampling and ground sample unloading; the negative pressure sampling probe is composed of a plurality of layers of sampling bottles; each sampling barrel is provided with a normally-closed electromagnetic valve, and the electromagnetic valve is controlled by the ground host to be opened and closed. A plurality of sampling barrels in the probe can be designed and managed at a time, sampling work of a plurality of depthpoints can be completed ev