The invention relates to a calculating method of a broken rock seepage field in process of driving sand by water. The method comprises the steps of building a physical quantity relationship block diagram in a seepage process according to a mass conservation equation, a momentum conservation equation, a hole compression equation and a permeability parameter-sand volume fraction relational expression; designing a calculation method of the seepage field according to the physical quantity relationship block diagram, wherein the change of the sand volume fraction is caused by lost water in the course of driving the sand by the water, the influence on the fluidity, a non-Darcy flow beta factor and an acceleration coefficient caused by the sand volume fraction are considered; calculating the permeability parameters of all nodes; calculating the water and sand fluidities, the non-Darcy flow beta factor, the acceleration coefficient, the non-Darcy flow beta factor and acceleration coefficient and the sand volume fraction can be calculated by an asynchronous iteration method in a time varying seepage field in an algorithm design, therefore the storage space can be saved, the operation speed is fast, the convergence and numerical stability are good, and the computed results are precise.