The invention relates to a penetration stabilizing device for a peanut combine. The device comprises a contour wheel, a digging shovel and a contour spring, wherein the contour wheel is fixedly connected with the digging shovel device; the digging shovel device is hinged on a frame at the front end of the body; the contour spring is arranged between the frame and the digging shovel device; the contour wheel and the digging shovel can rotate around the frame to realize that the digging shovel can regulate in time according to the land condition, so that the stabilization of a penetrating angle is ensured; and the fixed digging depth is ensured, and loss of peanuts is reduced. Furthermore, a hydraulic cylinder is in a floating state, so that the adaptability to terrain is improved.