The invention provides a cold cathode supporting use of a magnetron and a production method for the cold cathode head. The cold cathode includes an upper shielding cap and a lower shielding cap, and a power connection rod and the integral post tooth-shaped cold cathode head. The method includes preparing material, ball grinding and mixing, blank pressing and molding. According to the invention, since grapheme or/and carbon nanometer tubes, zinc oxide nanometer wires are adopted to mix with metal power for blank pressing, sintering and processing so as to prepare the integral post tooth-shaped cold cathode head, after primary electrons are emitted by the cold cathode head under the effect of high voltage, back bombardment of the primary electrons excites gear teeth to emit secondary electrons, and stable electron emission is formed in the repeat process and stable output can be achieved within only 40 nanoseconds. Therefore, compared with a thermionic cathode, advantages such as electron emitting capability of the thermionic cathode, high electron bombardment resistance and the like are kept and shortcomings of long pre-heating time, low starting rate and short service lifetime and the like are overcome. Compared with a cold cathode in background art, the cold cathode provided by the invention has characteristics of simple structure, high electron emitting capability, high electron bombardment resistance, pure frequency spectrum output, high and stable emitting speed and the like.