The invention discloses a chopped-mode energy-saving electromachining pulse power supply. The chopped-mode energy-saving electromachining pulse power supply comprises a second adjustable direct-current power supply, a first adjustable direct-current power supply, a main control single chip microprocessor, a stabilizing circuit, a first power switch pipe, a second power switch pipe, a first high voltage isolation diode, a second high voltage isolation diode, a pulse conversion and arc starting drive circuit, a pulse conversion and chopping drive circuit and a power supply regulation control circuit. By adopting the chopped-mode energy-saving electromachining pulse power supply, a current limiting resistor with severe energy consumption is canceled, the utilization rate of the pulse power supply can be increased; moreover, the power supply has the properties such as easiness in arching, self-adaptive voltage regulation and adjustability of pulse current parameters, and the pulse voltage, pulse current, pulse width and pulse interval can be independently adjusted.