Master batch with carbon nano tube as black pigment

The invention discloses master batch prepared with a carbon nano tube as black pigment and a thermoplastic mixture of the master batch. When the master batch is added into thermoplastic resin to prepare the polymer mixture, the weight percentage of the carbon nano tube is small than carbon black by about 30 times or below, and the carbon nano tube can roughly obtain the same or lower L* value of the carbon black.