The invention discloses an oil return way protection structure for a fuel pump. The oil return way protection structure for the fuel pump comprises a filtering plate arranged in a fuel pump mounting hole; and a plurality of filtering holes are formed in the filtering plate and are used for filtering lubricating oil flowing into fuel pump oil return holes. In addition, the invention further discloses a fuel pump assembly provided with the oil return way protection structure for the fuel pump and discloses an engine. The situation that particle impurities in the lubricating oil not timely flowing back to an oil sump during outage enter the fuel pump through the fuel pump oil return holes is avoided, protection on an oil return way of the fuel pump is achieved, and normal operation of the fuel pump is ensured.