Michael Chan is a make-believe triad character but his HK$1.4 million (US$180,500) Porsche is real, so was the mob-style hit that reduced it to a hulk of charred metal.
Police are describing the early-morning attack on Thursday as arson, Apple Daily reports.
No one was hurt and no suspects have been arrested.
Chan, who famously plays triad roles in his movies, found the gutted car when he went to check on it at an outdoor car park in Sai Kung.
A Nissan Fairlady with a LONGHAIR license plate and a Land Rover, parked on either side of the Porsche, were also razed.
Firemen found evidence of combustion gas inside the Porsche which they suspect ignited a huge fire.
High temperatures and dry air caused the blaze to spread quickly, they said.
Chan said the car, which is registered to his company, is frequently used by his son.
He said he knows of no reason why anyone would carry out such an attack.
Police are not ruling out a mob hit.
Chan, 71, is a former kickboxing and boxing champion, credentials that led him to martial arts and to lucrative movie contracts.
His triad roles have often fueled reports about his alleged real-life involvement with the Chinese mafia.
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