Oil sludge leaching system based on water circulation

An oil sludge leaching system based on water circulation comprises a first-stage leaching tank, a second-stage leaching tank, a third-stage leaching tank, a vibrating screen, a solid phase collecting tank, a leaching agent storage tank, a liquid temporary storage tank, a centrifugal separator, a flocculation precipitation tank and a filter press. The eluting agent storage tank and the third-stage eluting tank, the third-stage eluting tank and the second-stage eluting tank, and the second-stage eluting tank and the first-stage eluting tank are respectively connected through a pipeline provided with a water pump; the first-stage leaching tank and the second-stage leaching tank, the second-stage leaching tank and the third-stage leaching tank, the third-stage leaching tank and the vibrating screen, and the vibrating screen and the solid-phase collecting tank are respectively connected through pipelines provided with slurry pumps; the vibrating screen is connected with the flocculent precipitation tank through a