The invention discloses a deep well water tube fishing device. The fishing device mainly comprises a dog plate (5), three clamping jaws (6), an expansion shaft (7), a connecting tube (2) and a limiting sleeve (4). When a water tube (12) and a transmission shaft (10) which fall to the well bottom after being broken are fished, firstly the connecting tube (2) is pulled while the fishing device is placed into a deep well, and a cone on the lower portion of the expansion shaft (7) is inserted into the water tube (12) under the guide effect of the cone for positioning; and secondly, a steel wire rope (1) is utilized for lifting up the expansion shaft (7), the three clamping jaws (6) which are matched with a cone on the upper portion of the expansion shaft (7) and provided with pawl surfaces are driven to shift radially at the same time, and the pawl tips of the clamping jaws (6) are made clamped tightly to the inner wall of the water tube, so that the water tube (12) and the transmission shaft (10) are fished up. The deep well water tube fishing device is convenient and fast to operate, simple and safe in structure, and capable of saving time and reducing cost.