Using fake health certificates is not illegal if it does not have social hazards such as disturbing public order, endangering public safety, infringing personal rights and property rights; Those who have the above hazards are illegal acts, and the public security organs may give administrative personnel public security punishment according to law; If a crime is constituted, criminal responsibility shall be investigated according to law.
Legal objectivity:
Article 2 of People's Republic of China (PRC) Public Security Administration Punishment Law disturbs public order, endangers public safety, infringes on personal rights and property rights, and hinders social management, which is socially harmful. If a crime is constituted in accordance with the provisions of the Criminal Law of People's Republic of China (PRC), criminal responsibility shall be investigated according to law; If it is not serious enough for criminal punishment, the public security organ shall impose administrative penalties for public security in accordance with this law. Detention in Article 52 of the Law of People's Republic of China (PRC) on Public Security Administration Punishment 10 days or more 15 days or less may be imposed with a fine of 1000 yuan or less; If the circumstances are relatively minor, he shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan: (1) Forging, altering or buying or selling official documents, certificates, certification documents and seals of state organs, people's organizations, enterprises, institutions or other organizations; (4) Forging or altering a ship's registration number, trading or using a forged or altered ship's registration number, or altering a ship's engine number.