Positive multi-pole spark plugs, characterized by a metal housing, a ceramic insulator, a middle electrode, an electrode sheet and a wire thread rod; the metal housing has a structure with an upper opening and a lower opening, where an interior of the metal housing is firmly fitted with a ceramic insulator, the wire thread rod being connected to the central electrode, the wire thread rod and the central electrode being arranged within the ceramic insulator,with an end of the middle electrode from the ceramic insulator and firmly connected to the electrode plate, the electrode plate having at least two electrodes, the electrodes being positioned above the metal housing, where a cavity between the ceramic insulator and the inner side wall of the metal housing is provided to form a heat chamber.
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