The invention discloses an epoxy resin composition and a preparation method and application thereof. The epoxy resin composition comprises 80-150 parts of epoxy resin adhesive, 120-250 parts of cement and 40-80 parts of yellow sand. The epoxy resin composition has the advantages that the epoxy resin composition is prepared by adding the cement and the yellow sand of a specific proportion into the existing epoxy resin adhesive, the strength of the prepared epoxy resin composition can reach up to C80 after 4 hours of curing, the strength of the epoxy resin composition is evidently increased as compared with that of the epoxy resin adhesive, the strength of the epoxy resin composition is equivalent to the strength of a pile position, and the epoxy resin composition also has certain toughness, can guarantee that a pile head can bear hammering force during re-hammering and the overall bearing capacity of the pile position is unaffected and is especially applicable to pile head crack repairing; the epoxy resin composition is simple in preparation process, short in curing time and low in cost.