Auxiliary circle cutting device of portable plasma cutting machine

The utility model belongs to the field of machining cutting technologies, and particularly relates to an auxiliary circle cutting device of a portable plasma cutting machine. Comprising a support, a rotary arm installed in a suspended mode is arranged on the support, the rotary arm is connected with a rotary shaft vertically installed on the support, a cutting gun head of the plasma cutting machine is installed on the rotary arm, a muzzle of the cutting gun head is suspended, and the rotary shaft is connected with a rocking handle. The side, provided with the cutting gun head, of the rotary arm can extend or retract relative to the rotary shaft. A muzzle of the cutting gun head can be lifted or lowered relative to the rotary arm; hole edges cut by means of the auxiliary circle cutting device of the plasma cutting machine are smooth and free of burrs, circular holes of various sizes can be conveniently cut by adjusting the length of the side, provided with the cutting gun head, of the rotating arm relative to