The invention discloses a preparation method of a flake silver graphite electrical contact material. Particularly, the method comprises the following steps: calculating required graphite powder and silver carbonate powder according to the material proportions for a to-be-prepared silver graphite electrical contact, and weighing the graphite powder and the silver carbonate powder for later use; mixing the silver carbonate powder with the graphite powder, and obtaining a silver graphite billet coated with a silver layer at the outer side of the billet from the obtained silver carbonate and graphite mixed powder through the procedures of molding, roasting, sintering and decarbonizing; and further processing the silver graphite billet into strips through hot extrusion, and carrying out rolling and stamping to obtain the flake silver graphite electrical contact. According to the method disclosed by the invention, direct contact of brittle phase graphite and silver particles can be effectively reduced; mechanical and physical properties and the processability of the prepared product are relatively excellent; and a metallographic structure is relatively uniform.