Pharmaceutical use of c-met-specific drug containing quinoline ring, and preparation method thereof

A pharmaceutical use of a c-Met-specific drug containing a quinoline ring and a preparation method thereof, particularly related to a use of a compound of formula (I) in preparing a drug used to treat a cancer resulting from c-Met gene amplification. The compound of formula (I) has strong inhibition and selectivity with respect to a cancer resulting from c-Met gene amplification.