Silica and oil removing system for oily sewage

The invention discloses a silica and oil removing system for oily sewage, which comprises an oil removing device, a silica and oil removing pond, a filtering device and a softening device successively communicated via pipelines. The viscous oil sewage is connected with a liquid inlet of the oil removing device via a pipeline, the treated oily sewage is delivered out via the softening device, the silica and oil removing agent is added into the pipeline via a agent feeding system and fully reacts with the oily sewage in the silica and oil removing pond, the activated silica and captured oil are polymerized into large-particle oil, suspended matter and non-activated silica to be settled, and activated silica, oil and suspended matter and non-activated silica in the oily sewage are removed through mud and water separation. With the silica and oil removing system, the process flow of silica and oil removal is simplified, the operation is convenient, and the operating cost of sewage treatment is reduced.