▎ 摘　　要

NOVELTY - Composite dispersant comprises distilled water and 2-ethylhexyl sulfate sodium salt. USE - The composite dispersant is useful for blocking or slowing agglomeration of graphene in dispersion. ADVANTAGE - The prepared mixed electroplate liquid has uniform and stable graphene stable distribution; and is easy to obtain; and has low raw material cost and good environmental protection. The method is simple to operate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a preparation method of composite dispersant; a mixed electroplating solution comprising silver basic aqueous solution and graphene, where the silver basic aqueous solution includes potassium cyanide and silver ions; a preparation method of mixed electroplating solution.