The invention discloses a water drawing device for obtaining water sample from a predetermined depth in a drill hole. The water drawing device comprises an end shield mechanism, a barrel mechanism and a water storage mechanism; the top part of the end shield mechanism is connected with an attached power pump device, an end shield channel is arranged on the inner side of the end shield mechanism, the bottom of the end shield mechanism is in contact with the top part of a piston, the piston is arranged on the inner side of a barrel; a water inlet of the piston is arranged on the piston, the water inlet on the outer wall of the barrel body is arranged on the outer wall of the barrel body, the water inlet of the piston and the water inlet on the outer wall of the barrel body are the same in size and are located towards the same direction; a cylindrical water passage of the piston connected to the water inlet of the piston is arranged on the inner side of the piston, a handstand groove of the piston is arranged on the bottom of the piston, the handstand groove of the piston and a barrel groove on the bottom of the barrel structure are the same in size, and a spring is arranged between the two; a barrel groove water passage is arranged in the middle of the barrel groove, and the barrel groove water passage is connected with the water storage mechanism. The water drawing device is simple and reasonable in structure, and water samples from the predetermined depth in the drill hole can be extracted.