The invention discloses a portable thermocouple spot welding machine suitable for multiple materials and can inhibit generation of relatively large electric sparks under parameters of relatively high capacitance and relatively low voltage to form solder balls. A thermocouple is welded with various material surfaces with a high success rate through wire feeding, so that the problem that welding of the thermocouple on metal materials such as copper and aluminum by a conventional spot welding machine is not firm and even the thermocouple cannot be spot-welded is solved. Through adoption of a pen container type welding electrode and a function of automatically and quickly feeding wires, the phenomenon that the welding environment is severe is solved and the condition that the welding effect is poor as a result of an imprecise operation technology is avoided. The product designed by the invention is small in size, portable and easy to operate. Compared with conventional tin soldering and the thermocouple with a groove formed on the surface of a metal material, the temperature measuring precision is greatly improved, and a lot of energy loss as the temperature of an engineering material cannot be precisely measured or the temperature of the engineering material cannot be measured is reduced.