In 2011, Liu Ruilin signed with Orange Sky Entertainment and officially entered the entertainment industry; In 2012, Liu Ruilin was invited to serve as the image ambassador for Jiahe Cinema; In the same year, he participated in the live-action youth sci-fi drama 'Armor Hero Nava' as the 'returnee rich second generation' character Ma Kuohai; On December 31 of the same year, he performed at the Hong Kong New Year's Eve concert.
In September 2013, he starred in the film 'Remember the Song of Youth' directed by Ye Jing, playing the male lead Xue Beijing. In November, he appeared in the urban emotional drama 'My Male BFF' directed by Wang Jun, portraying the male supporting role Mo Xiaokang; On November 29, 'Armor Hero Nava' was broadcast.
On April 4, 2014, 'My Male BFF' starring Liu Ruilin, Chen Shu, Huang Lei, and others officially aired on Anhui TV, Shanghai Oriental TV, etc.