The invention relates to a pyrimidine derivative, a preparation method therefor and an application thereof in medicine. Particularly, the invention relates to a compound as shown in general formula (M) or a stereisomer, an aquo-complex, a metabolic product, a solvate, a pharmaceutically acceptable salt, a co-crystallization or a prodrug thereof; the preparation method thereof; and the application of the medicine composition thereof and the compound medicine compound in the medicine, particularly the application as an EGFR target spot inhibitor, wherein the definition of each substituent group in the general formula (M) is the same as that of the specification.