The invention discloses a heavy-current pulse signal source. A front panel sets the amplitude and pulse width of the heavy current, and a digital circuit generates a corresponding DC reference voltage, that is, an amplitude and pulse width control signal, so that the amplitude and pulse width precision of the heavy-current pulse is guaranteed; an analog switch inputs the DC reference voltage Vsd to the input end of a voltage-controlled constant current source within an effective level section of a simulated pulse width control signal Cw'; the voltage-controlled constant current source outputs a variable constant current having a linear relationship with the DC reference voltage Vsd, so that the requirements on sharp rising edge of the heavy current pulse and small overshoot are guaranteed. At the same time, according to the heavy-current pulse signal source, controlled digital circuits, that is, an amplitude control signal generation circuit and a pulse width control signal generation circuit are respectively connected with an analog circuit through two optocoupler isolation circuits OC1 and OC2 for control, so that damage possibly generated for the digital circuit by the analog circuit is avoided efficiently.