The utility model discloses a wet joint structure for prefabricating and splicing the connecting portion between a pier stand column and a cover beam. The structure comprises a steel plate, a cushion block, a hole and a cast-in-place concrete layer, wherein the steel plate is embedded to the top face of the pier stand column, the cushion block is arranged between the pier stand column and the cover beam in a cushion mode, and the hole penetrates through the cover beam. The cushion block is fixedly arranged on the steel plate. The connecting portion between the pier stand column and the cover beam is filled with the cast-in-place concrete layer. One port of the hole is communicated to the cast-in-place concrete layer. The steel plate and the cushion block are covered with the cast-in-place concrete layer. According to the wet joint structure, construction is convenient and fast, the construction precision requirement is low, the adjustable range is large, the construction difficulty is low, a large adjusting range can be preserved for site construction, structure stress requirements are met, the pier stand column and the cover beam can be well prefabricated and spliced to form a whole, and the requirement for rigidity, strength and stability needed in the cover beam erecting process is met.