Caprolactam hydrofining system

The embodiment of the utility model provides a caprolactam hydrofining system. The caprolactam hydrofining system comprises a hydrogenation feed preheater, a slurry bed hydrogenation reactor, a catalyst filter assembly and a fixed bed hydrogenation reactor, the hydrogenation feed preheater is used for preheating a crude caprolactam solution. The slurry bed hydrogenation reactor is used for carrying out catalytic hydrogenation reaction on the preheated crude caprolactam solution. A feed port of the catalyst filter assembly is connected with a discharge port of the slurry bed hydrogenation reactor and is used for filtering a catalyst in a caprolactam solution. The fixed bed hydrogenation reactor is provided with a material inlet and a material outlet, the material inlet is connected with the discharge hole of the catalyst filter assembly, and the fixed bed hydrogenation reactor is used for carrying out secondary hydrogenation reaction on the caprolactam solution in the fixed bed hydrogenation reactor. According