Underground water sampling device

The utility model relates to the technical field of hydrogeological exploration, in particular to an underground water sampling device. According to the technical scheme, the sampling device comprises a sampling bottle and two supports, a folding and unfolding assembly is installed between the two supports, the sampling bottle comprises a suspension cover, a suspension ring is arranged at the top of the suspension cover, a clamping rod and a plurality of supporting strips symmetrically arranged at equal intervals are fixedly connected to the bottom of the suspension cover, and the bottoms of the multiple supporting strips are jointly and fixedly connected with a first threaded cylinder; the periphery of the first threaded barrel is sleeved with a water storage barrel in a threaded mode, a sliding block is slidably connected to the inner wall of the water storage barrel, a supporting plate, a filtering plate and a water taking pipe are fixedly connected to the inner wall of the water storage barrel, a pluralit