What kind of bug is this? Please answer! !

From your picture, this is called sweet potato ant elephant, which generally refers to sweet potato weevil.

Sweet potato weevil belongs to COLEOPTERA and Formicidae. Adults are 5~8 mm long and slender as ants. All are blue-black, with metallic luster, except the terminal tentacles, chest and feet are orange red.

The head extends into a slender beak, shaped like a trunk, and the chewing mouthparts are attached to the end of the beak.