Device for sampling fluid from well

The utility model relates to a liquid sampling device which is used under a high-viscosity well in an oil field and can take out a viscous liquid sample under the well, and the viscous liquid sample is tested and analyzed. A straight cylinder 1 which enters the lower side of the well is divided into a power cylinder and a valve cylinder, and a motor 19 in the power cylinder drives a screw rod 24 to rotate. A working nut 27 on the screw rod and a valve rod 2 in the valve cylinder are connected as a shaft center line body, and the upper and the lower central holes in the valve cylinder can be opened and closed by valve core sleeves 5 6 7 8 on the valve rod 2. The nut 27 on the screw rod drives the valve rod to make rectilinear motion to realize the opening and the closing of the upper and the lower central holes of the valve cylinder and form an electric extractor. The electric extractor enters the lower side of the well, can extract high-viscosity liquid in the cylinder and then is closed. The utility model is used for sampling and testing.