A compound represented by a general formula, a pharmaceutically acceptable salt thereof or a stereoisomer thereof: Wherein R 1 is selected from the group consisting of the following groups that are unsubstituted or substituted by 1-2 Q 1 substituents; wherein 1-3 carbon atoms on the ring can be replaced with 1-3 hetero atoms and/or groups that can be identical or different and are selected from the group consisting of O, S m, N m, NCH 3 and C, provided that after the replacement, O and C in the ring are not adjacent to each other, p is 0, 1 or 2, Q 1 is selected from the group consisting of halogen, hydroxyl, amino, carboxyl, a C 1-4 alkyl group, a C 1-4 alkoxyl group, a C 1-4 alkylamino group, a di(C 1-4 alkyl)amino group and a C 3-6 cycloalkyl group; R 2 is selected from the group consisting of hydrogen, a C 1-4 alkyl group that is unsubstituted or substituted by 1-2 Q 2 substituents, a formyl group that is substituted by a Q 2 substituent or N m, Q 2 is selected from the group consisting of halogen, hydroxyl, amino, a C 1-4 alkyl group, a C 1-4 alkoxyl group, a C 1-4 alkylamino group, a di(C 1-4 alkyl)amino group, a C 1-4 alkylcarbonyloxy group, a C 1-4 alkylacylamino group, a C 1-4 alkylsulfonyl group, a C 1-4 alkylsulfonylamino group, a C 3-5 cycloalkyl group and a saturated or unsaturated 5-8-membered heterocyclyl group, wherein the C 3-5 cycloalkyl, the saturated or unsaturated 5-8-membered heterocyclyl can be further substituted by 1-2 Q 3 substituents, Q 3 is selected from the group consisting of halogen, hydroxyl, amino, a C 1-4 alkyl group, a C 1-4 alkoxyl group, a C 1-4 alkylamino group, a di(C 1-4 alkyl)amino group, a C 1-4 alkylcarbonyloxy group, a C 1-4 alkylacylamino group, a C 1-4 alkylsulfonyl group, a C 1-4 alkylsulfonylamino group and a halogen-substituted C 1-4 alkoxy group; R 3 is selected from the group consisting of fluoro, chloro, bromo, a C 1-4 alkyl group or a C 1-4 alkoxy group; R 4, R 5 and R 6 are each independently selected from the group consisting of hydrogen, fluoro or chloro; L is selected from the group consisting of a covalent bond, O, S m or N m; n is 1, 2 or 3; and m is 0, 1 or 2. R 1 is selected from the group consisting of the following groups that are unsubstituted or substituted by 1-2 Q 1 substituents; wherein 1-3 carbon atoms on the ring can be replaced with 1-3 hetero atoms and/or groups that can be identical or different and are selected from the group consisting of O, S m, N m, NCH 3 and C, provided that after the replacement, O and C in the ring are not adjacent to each other, p is 0, 1 or 2, Q 1 is selected from the group consisting of halogen, hydroxyl, amino, carboxyl, a C 1-4 alkyl group, a C 1-4 alkoxyl group, a C 1-4 alkylamino group, a di(C 1-4 alkyl)amino group and a C 3-6 cycloalkyl group; R 2 is selected from the group consisting of hydrogen, a C 1-4 alkyl group that is unsubstituted or substituted by 1-2 Q 2 substituents, a formyl group that is substituted by a Q 2 substituent or N m, Q 2 is selected from the group consisting of halogen, hydroxyl, amino, a C 1-4 alkyl group, a C 1-4 alkoxyl group, a C 1-4 alkylamino group, a di(C 1-4 alkyl)amino group, a C 1-4 alkylcarbonyloxy group, a C 1-4 alkylacylamino group, a C 1-4 alkylsulfonyl group, a C 1-4 alkylsulfonylamino group, a C 3-5 cycloalkyl group and a saturated or unsaturated 5-8-membered heterocyclyl group, wherein the C 3-5 cycloalkyl, the saturated or unsaturated 5-8-membered heterocyclyl can be further substituted by 1-2 Q 3 substituents, Q 3 is selected from the group consisting of halogen, hydroxyl, amino, a C 1-4 alkyl group, a C 1-4 alkoxyl group, a C 1-4 alkylamino group, a di(C 1-4 alkyl)amino group, a C 1-4 alkylcarbonyloxy group, a C 1-4 alkylacylamino group, a C 1-4 alkylsulfonyl group, a C 1-4 alkylsulfonylamino group and a halogen-substituted C 1-4 alkoxy group; R 3 is selected from the group consisting of fluoro, chloro, bromo, a C 1-4 alkyl group or a C 1-4 alkoxy group; R 4, R 5 and R 6 are each independently selected from the group consisting of hydrogen, fluoro or chloro; L is selected from the group consisting of a covalent bond, O, S m or N m; n is 1, 2 or 3; and m is 0, 1 or 2.