Facility for converting non-pressure flow state to pressure flow state

The invention discloses a facility for converting a non-pressure flow state to a pressure flow state. The facility comprises an upstream connecting section, a diffusion section, a slope section, a pond body section and a downstream connecting section connected sequentially. The diffusion section comprises a front diffusion section and a rear diffusion section; an overflow channel is arranged on aside wall of the front diffusion section; a diversion pier is arranged in the rear diffusion section; middle isolated piers are arranged in the slope section and the pond body section; the diversion pier and the middle isolated piers are arranged and connected in a straight line state, so that water entering the rear diffusion section flows into the slope section from three water channels, passesthrough the pond body section, enters the downstream connection section and enters a pressure pipe culvert; wave absorbing beams are arranged on a rear slope section of the slope section and a pond body front section of the po