In 2011, he signed with Orange Sky Entertainment and officially began his acting career.

In 2014, she gained attention for her role in the urban emotional drama "I Love My Boyfriend" and gradually expanded into the entertainment industry, trying different types of roles.

In 2015, the youth suspense film "I Am a Witness" in which he participated was released.

In 2016, he starred in the web drama "The Brother Who Sleeps on My Upper bunk", the youth film "Remember That Song of Youth 1969", and the modern comedy film "Grandfather's Age 38", which were successively broadcasted and released, and his acting skills steadily improved; In the same year, he was nominated as the best supporting role of the 33rd Hundred Flowers Award Award for Popular Film, and his acting skills were affirmed.

In 2017, participated in the historical fantasy drama "Three Lives, Three Generations, Ten Miles of Peach Blossoms"; In the same year, he starred in the urban emotional drama "While We're Still Young" and won the Newcomer Award at the 16th China Film Performance Arts Society Awards for his inspirational comedy film "Get Off! Tumor Lord", becoming an important milestone in his acting career.

In 2018, starred in the ancient costume romance drama 'Fire Like a Song'.

In 2019, starred in the nostalgic youth campus drama "The True Colors of Jia Ren".

From 2020 to 2023, Liu Ruilin continued to be active on the screen, starring in historical fantasy dramas such as "Three Lives, Three Generations, Pillow Book", contemporary urban anti spy dramas with national security themes such as "Storm Eye", and fantasy romantic sweet pet dramas such as "Miss Raven and Mr. Lizard".

In 2024, the TV drama "Happy Parents Group" and the military drama "Sea and Sky Eagle" in which he participated will be broadcasted; On June 27th, the iQiyi All Star Sports Social Reality Show "I Play Basketball in Hengdian" was broadcasted.