Sewage filtration system

The invention discloses a sewage filtration system which comprises a primary filter and a secondary filter. The primary filter comprises a primary water tank, a transfer pipe, a sludge discharge assembly and a sludge discharge tank; scrubbing plates are formed on the outer wall of the lower portion of the transfer pipe; scrubbing heads are formed on the scrubbing plates; a secondary water outlet pipe is arranged at the upper end of the secondary filter, and a water inlet pipe and a drainage pipe are arranged at the lower end of the secondary filter; when the system works, a water inlet solenoid valve and a centrifugal pump are switched on, the water after the primary filtration flows into the secondary filter from a primary filtration pipe, a solenoid valve is switched on, the water after secondary filtration is drained from the secondary water outlet pipe, and the water after secondary filtration flows into the primary water tank through a sewage pipe again for primary filtration; due to the fact that power generation equipment is arranged, the sewage filtration system can be used in an area free of power grid coverage, and energy consumption and environmental protection are achieved.