Sewage surface floating oil absorption and separation system and method

The invention provides a sewage surface floating oil absorption and separation system and method. The system comprises a vacuum pump; the intermediate tank is communicated with a sewage pool pipeline, and the upper part of the intermediate tank is connected to the vacuum pump; the oil-water separation tank is arranged to be communicated with the intermediate tank through a pipeline and comprises an oil stain separation pool, the oil stain separation pool is divided into an oil-water mixing pool and an oil stain pool by a separation partition plate, and an oil stain outlet is formed in the lower part of the oil stain pool; and the pipeline mechanism comprises a pipeline component for realizing pipeline communication. According to the sewage surface floating oil absorption and separation system provided by the invention, negative pressure suction of an oil-water mixture and secondary oil-water separation treatment are controlled through the vacuum pump and the valve group, and a negative pressure suction mode i