A portable vacuum generator for use in a portable medical device for discharging exudates of a wound portion, comprising: a main power switch for turning the portable vacuum generator on or off; a vacuum pump having a motor for generating negative pressure according to driving of the motor; a pressure sensor for sensing pressure applied to the vacuum pump; a battery that supplies power to the vacuum pump; a controller for maintaining pressure of the vacuum pump within a range of pressure between a preset minimum pressure of 50 millimeter of mercury (mmHg) and a preset maximum pressure of 130 mmHg, wherein the controller is designed to repeatedly generate a first control signal for blocking the power supply for the pump driving motor until the pressure of the pump falls down to the preset minimum pressure in a case where the current pressure detected by the pressure sensor reaches the preset maximum pressure, and a second control signal for driving the pump driving motor until the current pressure reaches the preset maximum pressure in a case where the current pressure falls down to the preset minimum pressure so that exudates of a wound portion are continuously discharged through a drain tube at a vacuum mode while the main power switch is on; a first relay that is connected to an output end of the controller and is activated in response to the first control signal of the controller and is deactivated in response to the second control signal; and a second relay that is linked to the first relay and operates in a complimentary form, and that is deactivated when the first relay is activated to thus block the power supply for the pump driving motor, and is activated when the first relay is deactivated to thus resume the power supply for the pump driving motor. a main power switch for turning the portable vacuum generator on or off; a vacuum pump having a motor for generating negative pressure according to driving of the motor; a pressure sensor for sensing pressure applied to the vacuum pump; a battery that supplies power to the vacuum pump; a controller for maintaining pressure of the vacuum pump within a range of pressure between a preset minimum pressure of 50 millimeter of mercury (mmHg) and a preset maximum pressure of 130 mmHg, wherein the controller is designed to repeatedly generate a first control signal for blocking the power supply for the pump driving motor until the pressure of the pump falls down to the preset minimum pressure in a case where the current pressure detected by the pressure sensor reaches the preset maximum pressure, and a second control signal for driving the pump driving motor until the current pressure reaches the preset maximum pressure in a case where the current pressure falls down to the preset minimum pressure so that exudates of a wound portion are continuously discharged through a drain tube at a vacuum mode while the main power switch is on; a first relay that is connected to an output end of the controller and is activated in response to the first control signal of the controller and is deactivated in response to the second control signal; and a second relay that is linked to the first relay and operates in a complimentary form, and that is deactivated when the first relay is activated to thus block the power supply for the pump driving motor, and is activated when the first relay is deactivated to thus resume the power supply for the pump driving motor.