The invention provides a full-automatic driving method, apparatus and system upon severe weather and relates to the field of train automatic driving. The method comprises steps of receiving a trigger instruction sent by an ATS system when a user triggers a severe weather driving mode, acquiring train operation parameters corresponding to the severe weather driving mode, and sending the train operation parameters to a vehicle-mounted controller to control the train and to realize full-automatic driving upon severe weather. Beneficial exploration is brought to full-automatic driving upon rainy and snowy days.