The present invention discloses a nitrogen-containing fused ring compound, a preparation method therefor, and a use thereof. The structure of the nitrogen-containing fused ring compound of the present invention is represented by formula (I) below, wherein each group is as defined in the specification. The nitrogen-containing fused ring compound of the present invention is a novel, specific irreversible FGFR kinase inhibitor applicable to the treatment of related diseases such as tumors caused by FGFR kinase abnormalities.