The present invention belongs to the field of biomedicine and relates to use of cannabidiol in the preparation of anti-influenza drugs. Specifically, the present invention relates to use of any one of (1) to (3) below in the preparation of drugs for treating or preventing influenza or drugs for relieving an influenza symptom: (1) cannabidiol or a pharmaceutically acceptable salt or ester thereof； (2) a plant extract containing cannabidiol； preferably, a cannabis extract containing cannabidiol； preferably, an industrial cannabis extract containing cannabidiol； and (3) a pharmaceutical composition, containing an effective amount of cannabidiol or a pharmaceutically acceptable salt or ester thereof, and one or more pharmaceutically acceptable auxiliary materials. The cannabidiol can effectively inhibit influenza viruses, and has the potential to prepare or be used as a drug for treating or preventing influenza.
