The invention relates to a micro-electronics welding technology and particularly relates to a welding method for a sensing IC (Integrated Circuit) card. A one-time empty welding step is added after a spray welding nozzle is returned to a reset position, so that the residual temperature of the spray welding nozzle is about 1100DEG C before the first welding point of each sensing IC card is welded to cause the residual temperature of the spray welding nozzle to be almost same with the residual temperature before a second welding point is welded, and the relative equivalence property of two-time welding conditions is guaranteed so as to fully guarantee the welding effect and the welding quality. After the welding method disclosed by the invention is used for improvement, the welding yield can be guaranteed to be almost 100%.