The invention discloses a dregs-blocking anti-backflow intercepting well which comprises an intercepting well structure.A water inlet pipe is connected to the front end of the intercepting well structure, the rear end of the intercepting well structure is communicated with natural water, and a sewage intercepting pipe leading to a sewage treatment plant is connected to the side of the interception well structure; the dregs-blocking anti-backflow intercepting well further comprises a flow control gate used for controlling the flow of the sewage intercepting pipe, a flow control gate executive mechanism is connected to the flow control gate through a connecting shaft, the dregs-blocking anti-backflow intercepting well further comprises a dregs-blocking device which forms an angle with the water inlet direction of the interception well structure or is perpendicular to the water inlet direction of the interception well structure, and an anti-backflow device is arranged on the down stream of the dregs-blocking device.According to the dregs-blocking anti-backflow intercepting well, the dregs-blocking device and the anti-backflow device both have multiple forms, and the dregs-blocking anti-backflow intercepting well is capable of being applied to various occasions, wide in application range, high in market practicability and high in economic value.