Underground water sampling device for geological survey

The invention relates to an underground water sampling device for geological survey, which comprises a rectangular frame body and a balancing weight arranged at the lower end of the rectangular frame body, and further comprises two guide rails respectively arranged on two sides of the rectangular frame body; the sampling boxes comprise the first sampling box, the two second sampling boxes and the two third sampling boxes, the first sampling box is fixedly connected to the middle of the guide rail, the two second sampling boxes and the two third sampling boxes are symmetrically distributed on the two sides of the first sampling box, and sliding blocks are arranged on the second sampling boxes and the third sampling boxes; the sliding block is in sliding connection with the guide rail, and the sampling box is used for sampling underground water of different water layers; through cooperative arrangement of the rectangular frame body, the guide rails, the sampling boxes, the sliding blocks, the first lead screw a