The invention relates to the technical field of excavating equipment, in particular to a topsoil stripping device. The topsoil stripping device comprises a vehicle body, a rotary excavating rotor rotationally arranged on the vehicle body and a conveying mechanism arranged on the vehicle and the rotary excavating rotor, wherein the rotary excavating rotor comprises a barrel and cutter heads, the barrel is vertical to the advancing direction of the vehicle body, an accommodating cavity is formed in the barrel, through holes communicated with the accommodating cavity are formed in the side wall of the barrel, and the conveying mechanism extends into the accommodating cavity; the multiple cutter heads are arranged on the barrel by approaching the corresponding through holes, and the through holes are located on one sides, facing the rotating direction of the barrel, of the cutter heads. The topsoil stripping device is high in degree of automation, high in working efficiency and good in stripped topsoil quality.