Improved oil separation tank

The invention discloses an improved oil separation tank which comprises a concrete cavity, an oily wastewater inlet pipe and a wastewater drainage pipe; a filter tank, a floating oil tank and a clarification tank which are arranged in a delta shape are arranged in the concrete cavity, and openings of the filter tank, the floating oil tank and the clarification tank face one side deviating from theground; the oily wastewater inlet pipe is communicated with the filter tank; the wastewater drainage pipe is communicated with the filter tank; a top opening communicated with the floating oil tank is formed in the side wall of the filter tank; a filter screen is arranged in the top opening; and a bottom opening and a top opening which are communicated with the clarification tank are formed in the side wall of the floating oil tank. The oil-water separation effect is strong, and waste oil and other dirt impurities in the oily wastewater are effectively prevented from entering a sewer pipe network. 本发明公开了一种改进型隔油池，包括混凝