Belonging to the technical field of treatment of contaminated oil, the invention discloses oil extraction 
filtration equipment and a 
filtration method. The equipment includes a main tank body, the inside of the main tank body is sequentially provided with an air-water mixer, a conical primary filter, overflow settlers, a floc interceptor, a coalescing separator, a water collecting tank and an oilcollecting tank from the bottom up. The water collecting tank is communicated with a water outlet 
pipe, the oil collecting tank is communicated with an oil outlet 
pipe, and an air outlet 
pipe is disposed above the main tank body. The equipment provided by the invention combines 
flocculation, air flotation, oxidation, suspension layer 
filtration, coalescence and filtration into a whole, is equippedwith a floc interception layer, a standby filter and a plurality of overflow settlers, has the characteristics of high treatment efficiency, fast formation of filter layer, strong adaptability, and flexible and stable operation, and is suitable for treatment of various 
sewage containing suspended matters, is especially suitable for suspension filtration of high 
salinity and 
high density oily 
sewage hardly adaptable by existing similar technologies, also has the advantages of low 
energy consumption, small 
land occupation and investment, and low 
operating cost, thus being suitable for popularization and use.