The support is expressed in a non-binding resolution that was voted through with a crushing margin in Strasbourg on Thursday with 546 yes votes against 3 no and 44 abstentions.
All Swedish members voted in favor.
Gui Minhai was arrested for the first time in October 2015 and was sentenced in 2020 to ten years in prison, accused of "providing foreign power with intelligence".
Corrected: In an earlier version, there was incorrect information about how the Swedish members voted.
