The invention discloses a fracturing ball for an oil-gas well fracturing process and a preparation method thereof. The fracturing ball is a core/shell structure comprising a core and a shell, wherein the shell directly coats the outer surface of the core; the core and the shell have different dissolution velocities in fracturing fluid; and the dissolution velocity of the core is higher than the dissolution velocity of the shell. According to the fracturing ball for the oil-gas well fracturing process, the dissolution times of the core and the shell in the fracturing fluid are controlled through reasonably controlling the components and the thicknesses of the core and the shell, so that not only the support strength requirement in the oil-gas well fracturing operation can be satisfied, but also the total dissolution under the shaft can be realized without needing the return operation, and the production efficiency is greatly improved.