The invention discloses an automobile generator voltage regulating module and circuit. The automobile generator voltage regulating module comprises a driving unit, a selecting unit, a first control unit and a second control unit, wherein the driving unit disconnects an output terminal and a ground terminal when power input exists at the input end of the driving unit; the first control unit and the second control unit limit the output voltage of a generator to a relatively high first set value and a relatively low second set value respectively; the selecting unit selects the second control unit to control the state of the driving unit when ambient temperature is higher than or equal to a set threshold value, and selects the first control unit to control the state of the driving unit when the ambient temperature is lower than the set threshold value. The automobile generator voltage regulating module enables the generator to supply different output voltages when the ambient temperature is relatively high and relatively low, thereby avoiding over-charging of a storage battery at the high temperature and insufficient charging of the storage battery at the low temperature and further effectively prolonging the service life of the storage battery.