A toilet inlet valve, comprising a valve body , an inlet pipe , a water stop device with a water stop rubber gasket , a float bowl device , a raising rod device and an outlet pipe , wherein the water stop device also comprises: a water stop seat , which is located, with respect to the flow direction of water, at the front end of the outlet pipe , an opening of the water stop seat is coupling with the end face of the water stop rubber gasket ; a tray , which is connected to the water stop rubber gasket , and is located at the side of the water stop rubber gasket that is opposite with respect to the water stop seat ; a needle valve , which is fixed to the tray , and is located at the side of the tray that is opposite with respect to the water stop rubber gasket ; a back pressure cavity, which is a cavity with a discharge hole , the back pressure cavity containing a needle valve cover , the tray , the needle valve and the water stop rubber gasket , wherein the back pressure cavity is further provided with a needle valve hole in the needle valve cover , the needle valve hole sleeving to the needle valve ; wherein water enters the valve body through the inlet pipe in which inlet pipe the water is divided into two ways, one way is a main way, the other way is a control branch; wherein in the main way, water enters a fluid cavity of the inlet pipe , and after the fluid cavity reaches the water stop rubber gasket , and wherein then a reverse water pressure to the water stop rubber gasket is generated, which reverse water pressure is provided with an opposite direction to the water flow direction in the inlet pipe ; and wherein in the control branch, water passes through a gap between the needle valve and the needle valve hole , and then reaches the back pressure cavity, and wherein then a downstream water pressure to the tray is generated, which downstream water pressure is provided with same direction to the water flow direction in the inlet pipe . a water stop seat , which is located, with respect to the flow direction of water, at the front end of the outlet pipe , an opening of the water stop seat is coupling with the end face of the water stop rubber gasket ; a tray , which is connected to the water stop rubber gasket , and is located at the side of the water stop rubber gasket that is opposite with respect to the water stop seat ; a needle valve , which is fixed to the tray , and is located at the side of the tray that is opposite with respect to the water stop rubber gasket ; a back pressure cavity, which is a cavity with a discharge hole , the back pressure cavity containing a needle valve cover , the tray , the needle valve and the water stop rubber gasket , wherein the back pressure cavity is further provided with a needle valve hole in the needle valve cover , the needle valve hole sleeving to the needle valve ; wherein water enters the valve body through the inlet pipe in which inlet pipe the water is divided into two ways, one way is a main way, the other way is a control branch; wherein in the main way, water enters a fluid cavity of the inlet pipe , and after the fluid cavity reaches the water stop rubber gasket , and wherein then a reverse water pressure to the water stop rubber gasket is generated, which reverse water pressure is provided with an opposite direction to the water flow direction in the inlet pipe ; and wherein in the control branch, water passes through a gap between the needle valve and the needle valve hole , and then reaches the back pressure cavity, and wherein then a downstream water pressure to the tray is generated, which downstream water pressure is provided with same direction to the water flow direction in the inlet pipe . <EOS>