Provided is a gun type threading apparatus. A hand sewing needle is placed on a support of a gun head, a thread guide iron needle is arranged on a magnet rod of a gun bore, the thread guide iron needle can penetrate through a hole of the hand sewing needle after a user pulls a trigger with a finger, and therefore a thread is guided into the hole of the hand sewing needle; after the thread is guided into the hole of the hand sewing needle, the thread retreats from a needle opening of a threading hole of the thread guide iron needle, at the moment, the thread can stay in the hole of the hand sewing needle, then the finger is relaxed, the trigger restores the original state under the effect of a spring, the magnet rod drives the thread guide iron needle to retreat from the hole of the hand sewing needle, the threading in the hole of the hand sewing needle is completed, and then the thread is cut off according to the required length. Finally, the thread from the gun head is put into the needle opening of the thread guide iron needle for the next time of threading. An LED lamp is fixed to the lower side of the front side of the gun bore, a lamp switch is switched on during threading, the LED lamp can illuminate the hole of the hand sewing needle, and therefore whether the tip of the thread guide iron needle is aligned with the center of the hole of the hand sewing needle or not canbe more clearly seen. Thus, threading is more convenient and easier, and the speed is higher.