The Jat protesters are demanding reservation under the OBC category in government jobs and educational institutions.
The "Murder" actress, who comes from a small village in Hisar district of Haryana , took to Twitter to make her appeal.
"My appeal to the jaat community to maintain peace and nonviolence #JaatReservation #jaatagitation #haryana," Mallika tweeted.
The actress is known for her bold performances in films such as "Khwahish" and "Murder", and was last seen on screen in the 2015 film "Dirty Politics".
Last week, actor Randeep Hooda, who belongs to the Jat community, also urged Jats to refrain from using violent measures and to seek a way out of the problem in a peaceful manner.