Sampling device for water quality detection

According to the technical scheme, the sampling device is characterized by comprising a tank body, a guide opening is formed in the center of the lower end face of the tank body, a plurality of evenly-arranged water inlets are formed in the positions, located on the periphery of the guide opening, of the lower end face of the tank body, and a movable valve capable of freely moving up and down is inserted into the inner side of the guide opening in a penetrating mode; the movable valve comprises a blocking plate located at the bottom of the inner side of the tank body, the tank body can be thrown into water through the rope, at the moment, the movable valve floats upwards under the dead weight of the tank body and the buoyancy effect of water so that the water inlet can be opened, and at the moment, water enters the tank body; under the action of water pressure, the blocking plate automatically blocks the water inlet, so that water sampling is completed, water sampling operation is more convenient, meanwhile,