The invention discloses a superconducting magnet leading-out terminal welding method used for welding a superconducting magnet leading-out terminal in a high-temperature superconducting magnet current lead and a transitional copper woven belt. The method includes: firstly, stripping the surface of the superconducting magnet leading-out terminal in an insulation manner, winding a tin wire on the surface of a superconducting tape closely and spirally, and then mounting the superconducting tape in a sleeve of the copper woven belt; secondly, after the position is fixed, using an epoxy retaining plate to separate the welding portion from a superconducting magnet, using an electric soldering iron to move backwards from one end of the copper woven belt gradually, and repeating for several times to enable inside soldering tin to be totally molten so as to achieve effect of fixing the tape and the copper woven belt; thirdly, after the soldering tin is completely cooled, connecting the other end of the copper woven belt with the current lead; finally, fixing the copper woven belt on an epoxy barrel. The method is simple and reliable to operate, the superconducting tape can be effectively protected, welding can be firm, joint resistance is ensured to be low, and heat emission rate is low.