The invention relates to a preparation method for pulp-added and vibrated gelatinized sand gravels and a product. The method comprises the following steps: a, collecting natural sand gravels on the construction site, culling particles with the particle size of over 150 mm, and using the sand gravels with a grade change as sand gravel materials for preparing a parent material; b, mixing water, cement, coal ash and the sand gravel materials according to a certain ratio so as to prepare gelatinized sand gravels serving as a parent material; c, adding pulp to prepare the pulp-added and vibrated gelatinized sand gravels by the prepared parent materials according to a certain pulp adding rate, wherein a method for determining the pulp adding rate comprises the following steps: preparing the pulp-added and vibrated gelatinized sand gravels by using the gelatinized sand gravels of the sand gravel materials with the thinnest grade and the average grade as the parent materials, and selectively determining the proper pulp adding rate by detecting the performance of a test sample. The method disclosed by the invention is simple, and the construction of a dam body is not interfered; furthermore, the prepared pulp-added and vibrated gelatinized sand gravels have the characteristics of higher mechanical strength, high anti-seepage property, high anti-freezing durability and low cost.