The invention provides a welding gun handle trigger with a micro-control switch. A structure of the welding gun handle trigger comprises a trigger body, a micro-control switch carrier and a micro-control switch assembly, wherein a middle of the trigger body is provided with a groove with an upper opening, a bottom of a middle part of the groove is provided with a fulcrum which is connected with a bottom of a trigger lever. A left end of the trigger lever is provided with a spring, a right end of the trigger lever is provided with a U type contact tongue, a bottom of the trigger body is provided with a ripple cambered surface, and a left end of the trigger body is provided with a pin aperture; an upper part of the micro-control switch carrier is provided with a notch, a middle of the notch is provided with a positioning step, two sides of the notch are opened with a ratchet aperture, the positioning step is level with a base of the ratchet aperture, and the micro-control switch assembly is provided in the groove. The welding gun handle trigger has the advantages of simple structure, reasonable design and convenient usage. A standard micro-control switch is provided in the welding gun handle trigger as a switch device, a control microcurrent driving welding machine intelligent controller is employed to start a welding machine for working, thus a service life of a trigger switch can be ensured, and security of welding machine usage can be raised.