Automatic throttling valve

The invention relates to a valve, and in particular to an automatic throttling valve. The automatic throttling valve comprises a valve frame, a pressure adjusting cavity formed at the upper part of the valve frame, and a rotating part located in the pressure adjusting cavity. The valve frame comprises a valve inlet and a valve outlet. The automatic throttling valve further comprises a fluid cavity located in front of the rotating part, and an adjusting part located at an outlet of the fluid cavity, and the fluid cavity and the pressure adjusting cavity are communicated. The adjusting part comprises a fluid pushing part and a gear adjusting part. The fluid pushing part comprises a piston and a piston rod connected with the piston. An elastic piece, a baffle and a first rack are sequentially arranged on the piston rod. The gear adjusting part comprises a first gear engaged with the first rack, a second gear and an adjusting plate from bottom to top, a second rack engaged with the second gear is arranged at the end, close to the second gear, of the adjusting plate, and the other end of the adjusting plate is communicated with the pressure adjusting cavity. By means of cooperation of the adjusting plate, the fluid pushing part, the gear adjusting part and tap water in the fluid cavity, the water pressure is automatically adjusted, and the phenomenon of liquid impacts is prevented.