The invention belongs to the technical field of charging piles, and more particularly to a charging pile assembly structure. The strip-shaped assembly slot of a fixing base can accommodate a pluralityof charging piles. Sliding members are slidably mounted in the guide rail slot of a fixing base bottom plate. Each charging pile is fixed to the fixing base by a first fastener and a sliding member having a threaded hole. The first fastener passes through the charging pile and then is in threaded connection to the sliding member of the guide rail slot, so that the charging pile is fixed to the fixing base. A plug connected to the open end of the fixing base is mounted on a mounting surface so that the charging piles can be installed on the mounting surface, thereby achieving convenient installation and reducing cost.