Adjustable discharge spout for pouring liquid

The utility model relates to an adjustable discharge spout for pouring liquid. The adjusting discharge spout comprises a ring-shaped discharge spout body and an elastic washer, wherein the elastic washer is attached to an inner ring surface of the ring-shaped discharge spout body, inner diameters of the ring-shaped discharge spout body and the elastic washer are adaptive to the outer diameter of an opening of a filling container, the ring-shaped discharge spout body tightly hoops the opening of the filling container, a reversed-L-shaped fixation block is inwards fixed on two sides of the ring-shaped discharge spout body, a sideward boss is arranged at the bottom end of the reversed-L-shaped fixation block, a groove is formed between the upper surface of the boss and two end walls of the top side of the reversed-L-shaped fixation block, the inner wall of the filling container and an opposite end of the reversed-L-shaped fixation block are inwards curved to form an elastic clamping head, the elastic clamping he