The present invention discloses a class of amino-substituted nitrogen-containing fused ring compounds, a preparation method therefor, and a use thereof. The structure of the amino-substituted nitrogen-containing fused ring compounds of the present invention is as shown in formula (I) below, and each group therein is as defined in the specification. The amino-substituted nitrogen-containing fused ring compounds of the present invention are novel specific FGFR kinase inhibitors, having excellent inhibitory activity for FGFR-related tumor cell proliferation, and is applicable to the treatment of diseases such as tumors associated with FGFR kinase mutations or abnormal expressions.