It is generally illegal to set fire to other people's cars, which may constitute the crime of vandalism. If the act of setting fire to a car endangers public safety, it may also constitute arson.
It is illegal to set fire to a car. If it causes serious consequences, it constitutes a crime and needs to bear corresponding criminal responsibility. The crime of intentionally destroying property or arson is suspected of endangering public security. I suggest you surrender yourself immediately, and actively compensate the victims, so as to get a lighter punishment.
Legal basis: Article 114 of the Criminal Law of People's Republic of China (PRC) sets fire, breaks water, explodes, releases toxic, radioactive, infectious disease pathogens and other substances, or endangers public safety by other dangerous methods, but no serious consequences have been caused, and he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years.
Article 115 Whoever sets fire, breaks water, explodes, releases toxic, radioactive, infectious disease pathogens and other substances, or causes serious injury, death or heavy losses to public or private property by other dangerous means, shall be sentenced to fixed-term imprisonment of not less than 10 years, life imprisonment or death. Whoever negligently commits the crime mentioned in the preceding paragraph shall be sentenced to fixed-term imprisonment of not less than three years but not more than seven years; If the circumstances are minor, they shall be sentenced to fixed-term imprisonment of not more than three years or criminal detention.