A charging pile, a method and device for recognizing the charging pile are provided. The charging pile may include: a pile body having a side surface; a power interface provided on the side surface of the pile body to supply power for the autonomous cleaning device; an identification structure arranged on the side surface of the pile body to enable the autonomous cleaning device to recognize a position of the power interface and comprising a plurality of identification elements, each of the plurality of identification elements comprising at least one convex and at least one concave; wherein a retroreflection coefficient of any one of the at least one convex and the at least one concave is smaller than that of the other one of the at least one convex and the at least one concave and sufficient to form a retroreflected light recognizable by the autonomous cleaning device; and wherein at least one of the plurality of identification elements comprises a convex and a concave having mismatched specifications.