She is the fifth actress to win National Award in Malayalam after legendary Sarada, Monisha, Sobhana and Meera Jasmine.
"I never expected this award... I expected only a jury mention... I am extremely happy...I was stunned for some time when heard about the news...," Surabhi, who is away in Muscat as part of a programme, said.
The actress, who did minor roles in around 20 movies and appeared in tele serials, also bagged special jury mention for her performance in the movie "Minnaminungu" (The Firefly) in the recently announced State Film Awards and Film Critics Award.
Jury Chairman Priyadarshan said Surabhi showcased "brilliant" performance which is why recognition came her way.
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"Her performance looked as if she was an experienced actress. Other jury members thought she was an established, seasoned actress. Surabhi carried the entire movie on her shoulders," he said.
Surabhi is more popular among television audience because of her character, Paathu, who speaks colloquial north Kerala slang in the TV show titled 'M80 Moosa'.
Meera Jasmine was the last Malayalam Actress to win the Best Actress National Award in 2004 for her performance in "Paadam Onnu: Oru Vilapam".
"This award is a great recognition for me and my film. It's an encouragement... Award brings in more responsibility," he said.