Gravity pressure water delivery system with automatic-adjusting weir well

The invention relates to a gravity pressure water delivery system with an automatic-adjusting weir well, in particular to a hydraulic adjustment and control system used for water delivery engineering. The system comprises: an adjusting weir well which is arranged between a water inlet and a water outlet and connected through a pipeline. The weir well comprises: a weir well water inlet connected with an upstream pipe at the bottom part of the inlet breast wall of the adjusting weir well, wherein two sides of the inlet breast wall are respectively connected with the side wall of the weir well; the outlet breast wall of the adjusting weir well is connected with the side wall of the weir well and the bottom part of the outlet breast wall is a weir well water outlet connected with a downstreamwater delivery pipe; an overflow weir is arranged at the bottom part of a shaft between the inlet and the outlet breast wall and lies across between two side walls; for longer gravity pressure water delivery engineering, diff