It is illegal to change the badge on a car, and you will be given a warning or a fine of not less than 20 yuan but not more than 200 yuan.

According to the "Road Traffic Safety Law of the People's Republic of China"

Article 16

No unit or individual may engage in the following acts:

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(1) Assembling a motor vehicle or changing the registered structure, structure or characteristics of the motor vehicle without authorization;

(2) Changing the motor vehicle model, engine number, frame number or vehicle identification number ;

(3) Forging, altering, or using forged or altered motor vehicle registration certificates, license plates, driving licenses, inspection marks, and insurance marks;

(4) Use the registration certificate, number plate, driving license, inspection mark, and insurance mark of other motor vehicles.

Article 87

The traffic management department of the public security organ and its traffic police shall promptly correct violations of road traffic safety laws. The traffic management department of the public security organ and its traffic police shall impose penalties on road traffic safety violations based on the facts and the relevant provisions of this law. For minor cases that do not affect road traffic, the illegal behavior will be pointed out and a verbal warning will be given before being released.

Article 88

The types of penalties for road traffic safety violations include: warnings, fines, temporary suspension or revocation of motor vehicle driving licenses, and detention.

Article 90

Any motor vehicle driver who violates road traffic safety laws and regulations regarding road traffic shall be given a warning or be fined not less than 20 yuan but not more than 200 yuan. If this law provides otherwise, punishment shall be in accordance with the provisions.