A chassis system of an amphibious remote control vehicle is provided, including a vehicle chassis and a hull form chassis, the vehicle chassis comprises a first joint portion and a second joint portion. The width of one end of the hull form chassis is smaller than that of one other end of the hull form chassis, the hull form chassis comprises a third joint portion being corresponding to the first joint portion and two fourth joint portions being corresponding to the second joint portion. The hull form chassis comprises a hull form chassis centerline, the hull form chassis centerline extends obliquely to two sides to form two inclined surfaces, the first joint portion is engaged with the third joint portion, and the second joint portion and the two fourth joint portion are combined by a fixing member.