The invention discloses a wet tin slag separation device which comprises a smelting furnace, a heating mechanism heating the smelting furnace and a tin slag conveying mechanism allowing tin slag to enter liquid soldering tin in the smelting furnace and is characterized in that the tin slag conveying mechanism comprises a tin slag push rod and a feeding barrel; the tin slag push rod is sheathed with the feeding barrel; a mixing barrel is arranged outside the feeding barrel; a tin slag separation channel is formed between the mixing barrel and the smelting furnace; one end of the tin slag push rod is connected with a mixing motor in a transmission manner; the other end of the tin slag push rod is located in the smelting furnace; and when the tin slag is separated, at least a part of tin slag push rod is located under the level of the liquid soldering tin in the smelting furnace. During separation, the tin slag is pushed into the liquid tin smelted in the smelting furnace and can be melted quickly; part of oxide with low density in the tin slag floats on the surface; and the tin slag can be separated from the smelting furnace by a special mechanism. Compared with the prior art, higher temperature and tin slag separation cost for the smelting furnace during direct heating separation can be avoided, and the tin slag separation efficiency can be improved at the same time.