A personal watercraft equipped with an engine cooling system and a cleaning system therefore, including a body 1 including a deck 3 and a hull 2, an engine E accommodated in the interior of the body 1, a cooling system configured to cool the engine E using water taken in from outside the body 1, and a flush pipe 39, one end of which is coupled to the cooling system to guide cleaning water to the cooling system, and an opposite end of the cleaning water supply line has an opening that is formed on the deck 3 of the body 1 and is configured to open outward; and a coupling member 40 is attached to the opening to couple the cleaning water supply line to a cleaning water supply source located outside the body.