The invention relates to an electroplating support system for mandrel workpieces, which comprises a pull plating machine and a small rail car, wherein the small rail car is arranged on a track in front of the pull plating machine, a track trailer is arranged and operated on a track between the pull plating machine and the small rail car, a fixed shaft bracket is fixedly arranged on a ground foundation between the track trailer and the pull plating machine, and the fixed shaft bracket, the track trailer and the small rail car support a mandrel to be electroplated in the pull plating machine together. The support system is respectively provided with the fixed support bracket, the track trailer and the small rail car in front of the pull plating machine, the three devices can effectively adjust the supporting height of the mandrel, and the whole adjustment process is good in stability; and in addition, the electroplating support system is reliable in operation and convenient in adjustment, and ensures the quality of electroplating the mandrel by the pull plating machine.