The invention relates to a method for preparing superfine sliver powder uniform and concentrated in particle size. The method includes: (1) dissolving Arabic gum and potassium sulfate in water to obtain a system A; (2) adding water solution containing vitamin C into the system A, adding nitric acid after stirring and dispersing, and adjusting temperature to 30+/-2 DEC G to obtain a system B; (3) dissolving silver nitrate in water and adjusting temperature to 30+/-2 DEC G to obtain a system C; (4) pouring the system B into the system C quickly, allowing for standing for continuous reaction, mixing up while adding water for several times after reaction is over, performing centrifugal separation, taking out for centrifugalization, drying solid and grinding to obtain the superfine sliver powder. The method is simple to operate, wide in range of raw material sources and low in cost and has low requirements on equipment. The obtained superfine sliver powder is uniform and concentrated in particle size and consistent in shape.