Provided are a condensed heteroaryl derivative, a preparation method therefor, and application thereof in medicines. Specifically, provided are a condensed heteroaryl derivative represented by general formula (I), a preparation method therefor, a pharmaceutical composition comprising the derivative, and use of the derivative as a therapeutic agent, and in particular, use thereof as a TLR7 agonist, wherein substituents in the general formula have the same definitions as those in the description.