Disposable folding constant-volume water sampling kettle

The utility model discloses a disposable folding constant-volume water sampling kettle which comprises a kettle body, a water taking opening formed in the top of the kettle body, handles on the two sides and a handle at the rear end. The kettle body adopts a folding design, a first folding part is arranged at the middle part of the kettle body and is hermetically connected with the side plates on the two sides, and the first folding part is unfolded towards the two sides by pulling the handle, so that the kettle body is transversely pulled open from a flat state to a three-dimensional state, the volume of the kettle body is increased after the kettle body is unfolded, and water can be collected and stored after the kettle body is shaped. A water level observation column and a water level identification layer are further arranged on the side edge of the kettle body, so that the water sampling kettle can accurately collect a required water volume sample. A folding water taking funnel is further embedded in the