The invention discloses a novel two-stage filtration type water treatment system which comprises a primary filter and a secondary filter. The primary filter comprises a primary water tank, a lower filtering seat, a rotating tube, a rotating rod and a sludge containing tank. The lower filtering seat is connected with ceramic filtering plates, and rotating pieces and sludge pushing blades are formed on the outer wall of the rotating pipe. The outer ends of the rotating pieces are connected with scrubbing plates. Dirt delivery tooth pieces are formed on the outer wall of the rotating rod. A magnetic water inlet valve is installed on a water inlet through pipe. A centrifugal pump is installed on a primary filtering water pipe. A magnetic valve is installed on a sewage pipe. During working, the magnetic water inlet valve is turned on, water flows into the primary water tank, the centrifugal pump is started, the water flows between the primary water tank and the ceramic filtering plates, the water undergoing primary filtration flows from a primary filtration water pipe to the second filter, a magnetic valve is turned on every half an hour, water undergoing secondary filtration is discharged out of a secondary water outlet pipe, and sewage passing through a secondary filtration pipe re-flows into the primary water tank for primary filtration through the sewage pipe.