Membrane filtration reactor for sewage hardness removal

The invention provides a membrane filtration reactor for sewage hardness removal. The membrane filtration reactor comprises a tank body; the filtering membrane assembly is arranged in the tank body; the baffle is arranged below the filtering membrane component; the cyclone sludge concentration equipment is arranged below the baffle plate; and a water inlet pipe; wherein the bottom of the tank body is constructed into an inverted circular truncated cone, and a sludge discharge port and a water inlet tangent to the sludge discharge port are formed in the surface of the inverted circular truncated cone; the cyclone sludge concentration equipment comprises a sludge settling vat and a sludge discharge pipeline communicated with the sludge settling vat, and the sludge discharge pipeline penetrates through the sludge discharge port; the water inlet pipe is wound around the sludge discharge pipeline in a spiral rising shape and penetrates through the water inlet to extend into the tank body. The method can overcome t