▎ 摘　　要

NOVELTY - Preparing graphene/polypyrrole/carbon black conductive ink comprises (i) mixing carbon black and graphene/polypyrrole composite material, and grinding to obtain mixed conductive filler, (ii) preparing ethanol, ethylene glycol, glycerol and deionized water mixed solvent, and (iii) mixing mixed conductive filler obtained in step (i) and mixed solvent prepared in step (ii) with sodium carboxymethyl cellulose, ultrasonicating, and centrifuging to obtain supernatant i.e. graphene/polypyrrole/carbon black conductive ink. USE - The conductive ink is useful in flexible paper-based writing conductive line (claimed); and constructing conductive circuit. ADVANTAGE - The conductive ink has synergistic effect, excellent conductivity, fluidity and writing smoothness, low solid content, low viscosity, bending resistance, and simple preparation method. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) graphene/polypyrrole/carbon black conductive ink obtained by above method; and (2) flexible paper-based writing conductive line comprising loading graphene/polypyrrole/carbon black conductive ink into writing pen, and then writing directly on paper base material to obtain flexible paper-based conductive line.