Underground water fixed-depth sampling device for geological survey

The invention discloses an underground water fixed-depth sampling device for geological survey, and relates to the technical field of underground water sampling devices.The underground water fixed-depth sampling device comprises a movable floating plate, a water suction pump is fixedly connected to the upper surface of the movable floating plate, a water inlet pipe and an eduction pipe are connected to a water inlet and a water outlet of the water suction pump respectively, and two mounting side plates are fixedly connected to the upper surface of the movable floating plate; and the outer wall of one mounting side plate is fixedly connected with a servo motor, and the output end of the servo motor is fixedly connected with a hollow pipe shaft. The servo motor rotates to drive the water taking hose to go deep into the water surface, underground water sampling can be completed by starting the water suction pump, when water samples at different depths need to be taken, the servo motor is started again to enable