Ignition device and burner comprising same

The ignition device comprises an ignition needle and a grounding metal ring, the ignition needle comprises an insulator, an electrode needle body and an electric connecting wire, the insulator wraps the bottom of the electrode needle body, the top of the electrode needle body is exposed out of the top face of the insulator, the grounding metal ring is arranged on the peripheral face of the insulator in a sleeving mode, and the electric connecting wire is arranged on the grounding metal ring. The electric connecting wire is electrically connected to the bottom end of the electrode needle body, the projection of the bottom end of the electrode needle body in the radial direction of the ignition needle is located in the grounding metal ring, the peripheral face of the insulator is provided with an inwards-sunken tightening groove, and the grounding metal ring is located in the tightening groove. The tightening groove is formed in the peripheral surface of the insulator, the grounding metal ring is sleeved with t