The utility model relates to a water sampling device, in particular to a continuous water sampling device. The continuous water sampling device is mainly composed of a water sampling hose, a fixing ring, a counter weight circular ring, a connection part, a motor, a motor shaft, a winding shaft, a necking wire and a necking wire fixing circular ring. The counter weight circular ring is fixed with the water sampling hose through the connection part, and the motor is fixedly arranged in the counter weight circular ring; after the necking wire winds around the water sampling hose, the necking wire is fixed on the connection part. After the continuous water sampling device is placed in the water and gradually goes deep in the water depth direction, water in a water area can enter the water sampling hose continuously. Due to the fact that the wall thickness of the fixing ring is smaller and the counter weight circular ring has a circular-arc-shaped head, the water layer is not disturbed when the water sampling device operates in the water. After water sampling is over, the motor is powered on, and the necking wire is stretched, so that the water sampling hose can be bundled up, and the state of the water layer in the water sampling hose is kept. The continuous water sampling device has the advantages that the requirement for continuous water sampling can be achieved, and the time and the labor are saved.