The present invention relates to the field of pharmaceutical chemistry, and specifically, to a kind of oseltamivir derivatives that are neuraminidase inhibitors containing carbamido, a preparation method therefor, and medical uses thereof. The derivatives are mainly used for treating infectious diseases caused by viruses. The compounds in the present invention are derivatives represented by formula (I), and pharmaceutically-acceptable salts or isomers, R1, R2 and R3 being described in the claims and the specification.