The application belongs to the technical field of
medicine, and particularly relates to application of a 4-(4-diethylamino-1-methylbutylamino)-7-chloroquinoline derivative or a pharmaceutically acceptable salt thereof, or a
tautomer thereof, or an internal racemate thereof, or an external racemate thereof, or an
enantiomer thereof, or a
diastereomer thereof, or a pharmaceutical composition with the
active ingredient to preparation of a
medicine for preventing or treating
obesity and
obesity-related metabolic diseases. The 4-(4-diethylamino-1-methylbutylamino)-7-chloroquinoline derivative has a significant
curative effect on
obesity and related metabolic diseases. After
intragastric administration of the 4-(4-diethylamino-1-methylbutylamino)-7-chloroquinoline derivative to
obese mice induced by high-fat feed and high-
fructose drinking water, after 6 weeks, compared with a high-fat control group, the 4-(4-diethylamino-1-methylbutylamino)-7-chloroquinoline derivative inhibits more than 70% of
weight gain of the mice, and there is no
significant difference in
food intake and
water intake, and the 4-(4-diethylamino-1-methylbutylamino)-7-chloroquinoline derivative has a good clinical application prospect.