The invention discloses a surface tin-coating and moulding method for superconducting cables. The method includes the steps of melting tin, cleaning superconducting material, brushing with flux, tin-coating, removing the flux, and moulding to obtain the finished superconducting cable. The method has the advantages that processing time is short, production efficiency is high, the surface of the superconducting material can be tin-coated effectively, the superconducting cable can be shaped effectively, the superconducting material is protected from damage owing to the adoption of temperature control in the whole tin-coating and moulding process, the special flux, the cleaning material and moulding fixtures, and ideal shape can be obtained.