Water separation structure of integrated fuel oil prefilter

The invention relates to a water separation structure of an integrated fuel oil prefilter. The water separation structure comprises filter paper, a hydrophobic net and a water collection cavity, wherein the filter paper is arranged in a prefilter main shell; the water collection cavity is arranged under a prefilter lower end cover; the prefilter lower end cover comprises a lower end cover body anda fixed bulge communicated with the bottom part of the lower end cover body; the fixed bulge is fixedly arranged on the prefilter main shell; a first sealing ring is arranged at the periphery of thelower end cover body; a second sealing ring is arranged at the periphery of the fixed bulge; draining holes are also formed in the lower end cover body and are located above the water collection cavity. When the water separation structure disclosed by the invention is used, the first sealing ring is used for separating a dirty side of fuel oil from the water collection cavity, the second sealing ring is used for separating