A transport worker convicted of rioting and wounding with intent in Yuen Long in 2019 was jailed for seven years on Tuesday.
Wong Chi-wing, 60, was found guilty last week after a retrial for taking part in the violence nearly six years ago on July 21.
Wong's lawyer argued in mitigation last week that his client had a rather small part in the clashes.
But District Court judge Eddie Yip dismissed the plea.
Yip said the case was very serious.
Wong, he said, was among a group of white-shirted men that carried out what he described as an indiscriminate attack on others inside and near Yuen Long MTR station.
The sentencing starting point for two co-defendants in the case was seven years behind bars, Yip noted, and the same was applied to Wong with no discount offered.
Wong had been acquitted in 2021, and a higher court ordered a retrial after the Department of Justice won an appeal.