The invention relates to the technical field of oil exploration, and specifically relates to an oil distribution range marking device for oil exploration. The device comprises a fixed mechanism, an adjustment mechanism, a locking mechanism, a laying-off mechanism, a rolling mechanism, a protection box, a transmission mechanism, and a stirring mechanism. During marking, a worker can freely adjust the stretching length of a hand-held mechanism according to an oil distribution locus, so as to change the walking track of a roller and achieve the marking of an irregular distribution range. The device is flexible in structure, is simple and convenient in operation, and can effectively reduce the workload of the worker. The rolling mechanism can always make contact with the ground, can drive a laying-off hopper and a support to move up and down according to the topographic changes, thereby meeting the marking demands of various types of landforms, and enlarging the application range. The transmission mechanism can enable a force of the rolling mechanism to be transmitted to the stirring mechanism, thereby achieving a purpose that the laying-off hopper carries out the internal stirring while walking, enabling the laying-off speed of pigment to be higher, and preventing the blocking of pigment.