Underground water sampling equipment for groundwater investigation and use method

The invention relates to the technical field of underground water sampling devices, and provides underground water sampling equipment for underground water investigation and a use method of the underground water sampling equipment. The switch assembly can open and close the ports of the three sampling pipes at the same time through the upper end cover and the plugging disc under the transmission cooperation of the switch assembly and the lifting mechanism, so that water bodies of different depths can be sampled through the sampling pipes, three water body samples are sampled each time, contrast experiments can be conveniently carried out in the later period, and the detection result is greatly improved. The linkage mechanism can open the lower end opening of the sampling pipe through the transmission mechanism, so that water collected in the sampling pipe can flow out, the linkage mechanism can move the receiving mechanism, the receiving mechanism is moved to the position below the sampling assembly in advanc