The invention discloses an anti-backflow intelligent interception well with the functions of slag blocking and unpowered flow limiting, which comprises a sewage inlet pipe, an anti-backflow regulating weir, a floating slag stopper, an overflow outlet pipe, a non-powered flow limiter, and an intercepted sewage pipe, the anti-backflow regulating weir is set in the well and before the water outlet of the overflow outlet pipe; the floating slag catcher is set in the well, and is located between the anti-backflow regulating weir and the sewage inlet pipe; the unpowered flow limiting The device is arranged in the well and before the water outlet of the shut-off sewage pipe. The interception well of the present invention reduces overflow pollution, increases the interception multiple, slows down the pressure of the downstream sewage pipeline, can accurately limit the discharge of the combined pipe network, realizes quantitative control of sewage or initial rainwater pollutants, and can realize remote control, reduce The maintenance and management work has the characteristics of stable interception of sewage, stable operation of anti-backflow function, remarkable interception of floating objects, intelligent supervision and operation, and adapting to China's national conditions.