It is illegal for a worker to be fined for doing something wrong, but if the employer suffers losses due to the employee's work fault, the employer can claim compensation from the worker for the amount of losses, and the employer can fine the worker according to rules and regulations.
 [Legal Basis]
 In Article 39 of the Labor Contract Law of the People's Republic of China, the employer may terminate the labor contract if a worker has any of the following circumstances:
 （1） It is proved that the employee does not meet the employment conditions during the probation period;
 （2） Seriously violating the rules and regulations of the employing unit;
 （3） Serious dereliction of duty or engaging in malpractice for selfish ends, causing major damage to the employing unit;
 （4） The laborer establishes labor relations with other employers at the same time, which has a serious impact on the completion of the work tasks of his own unit, or refuses to correct after being proposed by the employer;
 （5） The labor contract is invalid due to the circumstances specified in Item 1 of Paragraph 1 of Article 26 of this Law;
 （6） Being investigated for criminal responsibility according to law.