The utility model relates to a multichannel gas spark switch based on ultraviolet pre-ionization technology. The multichannel gas spark switch based on ultraviolet pre-ionization technology comprises a main electrode I (1) in the shape of a circular flange disc and an electrode tip (12) thereof which are correspondingly arranged, a main electrode II (2) and a corresponding electrode tip (13) thereof, and a circular cylindrical switch casing (3) connected through fixing bolts (9). The multichannel gas spark switch based on ultraviolet pre-ionization technology is advantaged in that: 1, based on structural design of a trigger electrode, UV ionization is generated under a triggered condition; relatively rich initial electrons are distributed in a main gap; breakdown time-delay of a spark gap is shortened; a circular ring electrode is induced to generate multichannel parallel connection discharging to realize switch inductance reduction; electrode ablation is reduced, so service life of the switch is prolonged; and 2, the switch is a coaxially compact integral structure; a distance between main electrodes are extremely small; air pressure at an internal portion of the switch is improved; breakdown time-delay of the spark gap is effectively reduced, and spark inductance is further reduced, so a structure of a trigger generator is simplified.