A portable plasma device, comprising: a housing; a push member positioned on one surface of the housing and installed to be movable downward in a longitudinal direction of the housing to control emission of a plasma flame; a holding member provided on a surface opposite to one surface on which the push member is installed; a plasma emission part positioned on a lower portion of the housing; a gas inlet; a charging terminal; a power button; an external ground connection part; a setting button configured to set an output intensity of the plasma flame; and a display part configured to display a setting and operating state; wherein the plasma emission part is formed in an asymmetrical shape biased to one side with respect to a central axis of the housing in the longitudinal direction; the plasma emission part comprises an emission electrode configured to perform a plasma discharge, a ground electrode disposed to be spaced apart from the emission electrode so as to surround a periphery of the emission electrode and a dielectric wall positioned between the emission electrode and the ground electrode; the dielectric wall is coated on at least one of the emission electrode and the ground electrode; a transparent member is provided at an end of the plasma emission part; an inner space of the housing further comprises: a battery connected to the charging terminal to be charged and discharged; an oscillator configured to receive DC power from the battery and output AC power; a transformer configured to change a level of the AC power; a gas tube connected to the gas inlet; a valve connected to a portion of the gas tube to control a movement of gas by opening and closing operations; and a control circuit configured to control setting and operation of the plasma device. a housing; a push member positioned on one surface of the housing and installed to be movable downward in a longitudinal direction of the housing to control emission of a plasma flame; a holding member provided on a surface opposite to one surface on which the push member is installed; a plasma emission part positioned on a lower portion of the housing; a gas inlet; a charging terminal; a power button; an external ground connection part; a setting button configured to set an output intensity of the plasma flame; and a display part configured to display a setting and operating state; the plasma emission part is formed in an asymmetrical shape biased to one side with respect to a central axis of the housing in the longitudinal direction; the plasma emission part comprises an emission electrode configured to perform a plasma discharge, a ground electrode disposed to be spaced apart from the emission electrode so as to surround a periphery of the emission electrode and a dielectric wall positioned between the emission electrode and the ground electrode; the dielectric wall is coated on at least one of the emission electrode and the ground electrode; a transparent member is provided at an end of the plasma emission part; a battery connected to the charging terminal to be charged and discharged; an oscillator configured to receive DC power from the battery and output AC power; a transformer configured to change a level of the AC power; a gas tube connected to the gas inlet; a valve connected to a portion of the gas tube to control a movement of gas by opening and closing operations; and a control circuit configured to control setting and operation of the plasma device.