Negative pressure liquid sampling device

The utility model discloses a negative pressure liquid sampling device. The technical problem that a sample is usually contaminated in the sampling process of the conventional liquid sampling device is solved. The negative pressure liquid sampling device comprises a liquid storage tank (2), a sampling bottle (5) and a vacuumized container (4). Liquid (1) is contained in the liquid storage tank (2). One end of a U-shaped sampling tube (3) is positioned below the liquid level of the liquid (1) in the liquid storage tank (2), and the other end of the U-shaped sampling tube (3) penetrates through the vacuumized container (4), and then is positioned in the sampling bottle (5). A sealing nut (6) is arranged at an inlet of the vacuumized container (4). An outlet of the vacuumized container (4) is in sealed connection with a bottleneck of the sampling bottle (5). An exhaust tube (7) is arranged on the sidewall of the vacuumized container (4). The negative pressure liquid sampling device has the effects of time saving and labor saving, and the consistency between a sample and an original is ensured.