The invention provides a general generator speed controller, which is characterized in that the controller comprises a frequency detection control circuit and a stepping motor driving circuit; wherein, the frequency detection control circuit comprises a frequency detection circuit and a singlechip micro-controller MCU; the frequency detection circuit consists of a rectifier circuit, a voltage-reduction filter circuit and a comparator circuit; the rectifier circuit comprises rectifier diodes D2, D3, D4 and D5 and ceramic capacitors C6, C7, C16 and C19; the voltage-reduction filter circuit comprises resistances R4, R5 and R7, diodes D6 and D7, and capacitors C17 and C18; the comparator circuit comprises resistances R6 and R8, a capacitor C15, a diode D9 and a comparator U; the output terminal of the comparator is connected with the input terminal of the singlechip micro-controller MCU; the stepping motor driving circuit is provided with a stepping motor driver, the input terminal of which is connected with the output terminal of the singlechip micro-controller MCU and the output terminal of which is connected with the stepping motor M-phase; the control circuit power is supplied by a flywheel permanent magnetic generator AC power by the rectification and stabilization of AC input.