The invention discloses a preparation method of a water-borne silver-plated graphene high-conductivity coating. The preparation method comprises the following steps: mixing A g of graphene with B mL of water; performing ultrasonic concussion for 0.5-1 h; then adding D mL of a silver ammonia solution containing C g of silver ions; performing uniform stirring; adding a reductant with 1.5-3 times of silver molar weight; performing uniform stirring; placing a reaction system at 40-70 DEG C; performing a standing reaction for 10-60 min; adding E g of the mixed solution into an epoxy emulsion; then, adding F g of fumed silica; performing uniform stirring at a high speed; and after that, adding G g of a polyamide 650 curing agent emulsion; and performing uniform stirring to obtain the water-borne silver-plated graphene high-conductivity coating, wherein the ratio of A to B to C to D to E to F to G is 5:(100-200):(0.5-1.5):(50-100):(20-72):(0.05-0.15):(20-72). The prepared water-borne silver-plated graphene high-conductivity coating is low in coating specific resistance and high in corrosion resistance, and has a great potential application value in the aspects of conductive protection glue, anti-static coatings, earth screen heavy current impact resistance and corrosion resistance.