The invention discloses a side-by-side distribution-typed oil tank system, which is characterized in that: five oil tanks are sequentially distributed along the longitudinal direction of an airplane and are symmetrically distributed along a longitudinal axis and a transverse axis in an axon system adopting the gravity center of the airplane as an origin, two bubble-preventing oil tanks or counterweights are symmetrically distributed on the left side and the right side of the airplane, all oil tanks are sequentially connected with each other through connecting pieces and flexible rubber oil pipes according to a stipulated oil supply path, so the obvious variation of the position of the gravity center of the airplane with a flying swing layout caused by the consumption of the fuel oil can be overcome; and under the situation that the oil is non-uniformly absorbed because of stalling of one engine at one side of the airplane or asymmetric power of the engines at two sides of the airplane during flying, the position of the gravity center of the airplane can be maintained constant. In addition, the side-by-side distribution-typed oil tank system is simple to produce, has low cost and short period, is practical and reliable and is convenient to use, different fuel systems with different sizes can be produced according to a specific size of the airplane, and the side-by-side distribution-typed oil tank system is particularly suitable for the small-sized turbo-jet flying-swing layout unmanned proof airplane.