Positioning mechanism capable of adjusting valve switch positioning angle and valve

The utility model discloses a positioning mechanism capable of adjusting the positioning angle of a valve switch and a valve. The positioning piece is configured to rotate relative to the seat body, and the positioning piece is provided with a positioning part and a linkage hole used for being matched with the valve rod; the stop structure is rotatably arranged on the seat body, a plurality of stop parts are arranged on the stop structure, the distances between the stop parts and the rotation center line of the stop structure are different, and when the stop parts abut against the positioning part, the rotation of the positioning piece can be limited; wherein the locking structure has a first state and a second state, and in the first state, the locking structure can be fixed relative to the seat body; and in the second state, the stop structure rotates relative to the seat body, so that the stop part and the positioning part abut against the matched angle, the position of the valve switch is limited and posi