The invention belongs to the technical field of drills for petroleum, coal mines and exploration, and provides a whipstocking drill for an ultra-short-radius well. The whipstocking drill comprises several flexible drill rods which are sequentially connected end to end, wherein the flexible drill rod at an end portion is connected with a length compensation device, and the flexible drill rods are externally sleeved with several guide sleeves which are movably connected. The invention solves the technical problems of a long whipstocking length and an excessively large turning radius of curvature during whipstocking.