▎ 摘　　要

NOVELTY - The utility model claims a negative ion detector, it includes shell, the shell is provided with an air inlet and an air outlet, the shell is provided with a filtering layer, the fan and anion generator; the filtering layer is set at one side of the air inlet. negative ion generator is set at the air outlet; the anion generator comprises a direct current voltage generating device, a piezoelectric transformer and graphene release electrode, DC voltage generating device is used for generating voltage + DC voltage of 12V, a piezoelectric transformer connected with the output end of the direct-current voltage generating device. for converting the direct current voltage + 12V into the direct current negative high voltage, graphene release electrode by high voltage resistant lead is connected with the output end of the piezoelectric transformer; the graphene electrode is release electrode of cylindrical structure with a conical tip is made from graphene materials. negative ion detector of this utility model releases negative ion has high purity, large dose, and dose not generate large amount of ozone.