The invention provides a protective sleeve and a gate valve. The protective sleeve comprises a body; the bottom end of the body is provided with a mounting opening, the mounting opening extends inwards to form an accommodating cavity, and the accommodating cavity is used for accommodating a valve rod; the valve rod outside a hand wheel can be accommodated in the accommodating cavity, the body canblock external dust or gravels to making contact with the valve rod, then driving external threads on the valve rod are prevented from being attached with the dust or the gravel, the driving externalthreads and driving thread holes are prevented from being damaged, and the service life of the valve is prolonged.