The invention provides a preparation method of a novel clean silver-plated graphite electrical contact material. The method comprises the following steps of (1) plating solution preparation and (2) coating preparation, wherein plating solution preparation comprises the substeps of a, preparation of a preplating silver solution and b, preparation of a silver graphite composite plating solution, and coating preparation comprises the substeps of a, substrate treatment, b, silver layer preplating and c, silver graphite composite layer plating. The coating has the excellent conductivity, the contact resistance is 28-40 [mu]omega (the external torque is 5-20 N*m), the coating has the good thermal conductivity, and the thermal conductivity is 260-280 W*m-1*K-1, the coating has the excellent abrasion resistance, and the friction coefficient is 0.08-0.25 when the load at the room temperature and the ordinary pressure is 260 g; the service life is long and reaches the standard between the M1 and M2 of the disconnecting switch mechanical life grade in the mechanical life experiments (the clamp force is 400-600 N, and opening-closing experiments are conducted for 4000-6000 times, and the coating loss is 5-10 [mu]m); the coating has good corrosion resistance and reaches the neutral salt spray test national standard ten grade in the salt spray tests; the coating has good anti-sulfur capacity, and the anti-sulfur performance of the coating reaches the navigation mark QJ485-1988; and the good comprehensive performance of the coating can complete meet the outdoor working conditions of a high-voltage disconnecting switch.