The invention discloses a preparation method for high-specific-area type spherical silver powder. The preparation method includes the steps that firstly, a dispersing agent is dissolved in deionized water, a reducing agent is added in, after complete dissolving, a pH value adjusting agent is used for controlling a pH value of an initial reducing agent solution to be 1-2, and then a reducing agentsolution is obtained; secondly, an oxidizing agent solution and a process alkalinity pH value control agent solution are prepared and obtained correspondingly; thirdly, the obtained oxidizing agent solution and the obtained process alkalinity pH value control agent solution are dropwise added into the reducing agent solution at the same time through a peristaltic pump or a metering pump, a reducing reaction is performed, the dropwise adding speed is controlled between 0.25 L/min and 15 L/min, and a pH value of mixed reaction liquid is kept at 3-9; and fourthly, solid-liquid separation is performed, and the high-specific-area type spherical silver powder is obtained after drying; and the rate at which silver ions are reduced is adjusted in the reaction stage, it is achieved that the particle size and the shape of the silver powder generated in the mixed reaction solution are controlled, and therefore controllable preparation of a silver powder product is achieved, and the obtained silver powder has the high-specific-area characteristic.