The invention discloses a nanocarbon conductive high-toughness black masterbatch and a preparation method thereof, the nanocarbon conductive high-toughness black masterbatch is prepared from resin, acarbon conductive composition and a modifier, the pipe diameter of a carbon nanotube in the carbon conductive composition is 50-300nm, the pipe diameter ratio is 300-600, and the DBP absorption valueof carbon black is 150 *10 <-5>-210 *10<-5> M<3> / kg. According to the nano-carbon conductive high-toughness black masterbatch and the preparation method thereof provided by the invention, the carbon nanotubes are firstly subjected to pre-dispersion treatment, so that the later mixing uniformity is improved, the black masterbatch has extremely high conductivity and dispersity, the product has antistatic property and permanent retentivity, the resistance value is relatively low, and the mechanical properties of resin are greatly retained; and moreover, the temperature stability is good, the piezoresistive linearity is better, the dosage is small, the use of precise key equipment can be met, and the problems of slow response, short service life, large resistance and the like of the existing plastic electric conductor and the like are effectively solved.