The present invention discloses a method for fast fabricating microneedle arrays with an embossing process and a method for fabricating an embossing mold of a microneedle array, wherein a master pattern of a high aspect ratio silicon microneedle array is fabricated with a microelectromechanical technology, and the master pattern is used to fabricate an embossing mold; a thermosetting material is filled into the embossing mold; then, baking, pressing and mold-stripping are undertaken; thereby, disposable solid polymer microneedle arrays can be batch-fabricated.