The utility model discloses a tooth-shaped limiting mechanism capable of adjusting the opening degree of a valve, which comprises a
machine shell, a box body is arranged below the
machine shell, a connecting
pipe is fixedly connected below the box body, a valve body is arranged below the connecting
pipe, the tooth-shaped limiting mechanism further comprises an adjusting mechanism, and the adjusting mechanism comprises a valve rod arranged inside the box body. A main gear is fixedly connected to the bottom end of the valve rod, an adjusting plate is fixedly connected to the bottom end of the main gear, a connecting
assembly is arranged on the outer surface of the main gear, an auxiliary gear is rotatably connected to the interior of the box body, a screw rod is fixedly connected to the bottom end of the auxiliary gear, and a baffle is in threaded connection to the outer surface of the screw rod; guide assemblies are installed on the two sides of the upper portion of the baffle. The problems that when an existing valve is in some specific occasions, the valve needs to be limited at the specific opening degree, the limiting adjustment range of a traditional limiting mechanism is small, the valve needs to be opened firstly, then the opening degree is adjusted, and operation is tedious are solved.