The invention discloses water-based 
graphene / 
carbon nanotube composite electric-heating conversion 
printing ink and a preparation method thereof. The preparation method comprises the following steps: uniformly stirring a 
graphene microchip, a water-based non-ionic high-
polymer dispersant and water, and then dispersing so as to obtain a first dispersion; putting one-dimensional nano-
powder into inorganic strong acid, carrying out heating 
reflux, carrying out ultrasonic treatment, washing with water, and 
drying, so as to obtain a second dispersion; uniformly mixing the second dispersion with 
carbon black powder, a water-based anionic dispersant, 
sodium dodecyl 
benzene sulfonate, a water-based hydroxyl-modified nano-acrylic 
emulsion and 
dimethylethanolamine, and then dispersing so as to obtain a third dispersion; and mixing the first dispersion, the third dispersion and water-based resin, 
grinding, adding a flatting agent, a 
defoamer, a pH adjusting agent, a 
preservative and an anti-
settling agent, and uniformly mixing, so as to obtain the water-based 
graphene / 
carbon nanotube composite electric-heating conversion 
printing ink. The invention further discloses the water-based graphene / 
carbon nanotube composite electric-heating conversion 
printing ink.