The utility model relates to a portable generator voltage adjusting device, in particular to a portable generator voltage large-range tracking and adjusting device which is characterized by comprising a throttle valve installed between a carburetor and an air cylinder; an adjusting rod of the throttle valve is fixedly provided with an oil quantity control valve (1) so as to control the opening amplitude of the throttle valve by the rotary movement of the oil quantity control valve (1); and the oil quantity control valve (1) is in threaded connection with an adjusting bolt (2). The portable generator voltage large-range tracking and adjusting device can solve the problem that after the old generator load voltage adjusting device fails, the output voltage can not meet the load requirement, widen the adjusting range, and enable the output voltage to be capable of adjusted in the positive and negative large range, thus fundamentally solving the problem that the output voltage of the generator is over-high or over-low or changes along with load, and realizing that the load is tracked and adjusted, and the safe and reliable electric energy resource is provided.