Method for preparing small-grain-size flake silver powder for high-resolution display screen paste

The invention discloses a method for preparing small-grain-size flake silver powder for high-resolution display screen paste. The method includes the preparation steps that (1) a silver salt system solution is prepared; (2) a reduction system solution is prepared; (3) the silver salt system solution obtained in the step (1) and the reduction system solution obtained in the step (2) are made to react; (4) a product obtained in the step (3) is treated to obtain original ball-milled silver powder; (5) the original ball-milled silver powder obtained in the step (4) is subjected to ball-milling through grinding balls to obtain flake silver paste liquid; and (6) the flake silver paste liquid obtained in the step (5) is treated to obtain the small-grain-size flake silver powder for the high-resolution display screen silver paste, the grinding balls adopted during ball milling are mixed grinding balls of one or more types of agate balls and aluminum oxide ceramic balls of which the diameter is phi2 to phi3. The flake