Shiffrin – who won her first World Championships medal in 2013 – now has six golds, one silver and two bronzes, so also surpassed Ted Ligety’s record of five golds.
Slovakia’s World Cup overall leader Petra Vlhova took silver on the day – 0.86secs behind – with the Swiss team earning a sixth medal of the championships with Michelle Gisin taking bronze.
Shiffrin’s success moves her fourth on the all-time list for medals won by women at the World Championships.
Sweden’s Anja Parson and Marielle Goitschel of France won 11 each, while Germany’s Christl Cranz won 15 medals between 1934 and 1939.