The invention relates to an integrated oil-water separation device. Oil/water is firstly separated from food residues in a mixture of waste oil/water and the food residues generated in a catering industry by virtue of a residue filtration/discharge device; a liquid oil-water mixture enters an oil-water mixture collection zone by virtue of a connecting pipe and then is pumped into an oil-water separation zone for oil-water separation by virtue of a lifting pump according to the liquid level; solid food residues are pre-stored in the residue filtration/discharge device; when the residue filtration/discharge device is fully filled with the food residues, a residue discharge valve is opened, so that the solid food residues enter a residue-collection barrel for storage; when the residue-collection barrel is fully filled with the food residues, the residue-collection barrel is removed, the solid food residues are discharged from the residue-collection barrel, and the residue-discharged residue-collection barrel is recycled; the oil-water mixture is subjected to oil-water separation treatment in the oil-water separation zone, the oil subjected to oil-water separation enters an oil storage zone for storage by virtue of an oil discharge pipe, and water is discharged by virtue of a water discharge pump; and when the oil storage zone is fully filled with oil, the oil is discharged from the device by virtue of an oil discharge control valve.