Disclosed are an apparatus and a method for generating a constant current pulse wave, a medical operation method using the same, and a light generating apparatus. The apparatus for generating a constant current pulse wave comprises: a charge unit receiving a current and charging electric charges； a converter unit applying a constant voltage to a flash lamp during a first reference time and applying a constant current to the flash lamp during a second reference time by using the electric charges charged in the charge unit； and a controller operating in a constant voltage control mode to transmit a constant voltage control signal for controlling the converter unit to output the constant voltage, to the converter unit during the first reference time and operating in a constant current control mode to transmit a constant current control signal for controlling the converter unit to output the constant current, to the converter unit during the second reference time. Accordingly, a stable pulse wave of the constant current can be applied to the flash lamp.
