The invention provides a V-shaped tail layout unmanned plane with an oil tank embedded into a blended wing body, which can be used for executing flight missions on scientific research experiment, remote sensing, aerial photography and the like. The unmanned plane has the following characteristics that 1, the flight duration is longer and the implementation of the flight commission with higher requirement on flight time is facilitated; 2, the use is simple and the control is facilitated; 3, the stability is better and the unmanned plane is applicable for carrying equipment such as an autopilot, an aerial camera and a vidicon; and 4, the take-off and landing conditions are lowly required. The small unmanned plane according to one aspect of the invention comprises a plane body (1), wings (3), a tail wing (7), a left front oil tank (16), a left rear oil tank (15), a right front oil tank (13) and a right rear oil tank (14), wherein the wings (3) are connected onto the plane body (1); and the left front oil tank (16), the left rear oil tank (15), the right front oil tank (13) and the right rear oil tank (14) are arranged ahead of the left, behind the left, ahead of the right and behind the right in the plane body (1) respectively. According to a further aspect, the left front oil tank, the right front oil tank, the left rear oil tank and the right rear oil tank are in a shape matched with the wing type of the plane body, and have a balanced oil consumption sequence.