Legal analysis: Whether OEM production is illegal or not should be discussed in two aspects: First, if the trademark is authorized, this kind of OEM is not illegal; second, if it is not authorized, it is illegal.

Legal basis: Article 52 of the "Trademark Law of the People's Republic of China" Any of the following acts is an infringement of the exclusive right to register a trademark:

(1) ) Without the permission of the trademark registrant, using a trademark that is identical or similar to the registered trademark on the same or similar goods;

(2) Selling goods that infringe the exclusive right of a registered trademark;

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(3) Forgery or unauthorized manufacture of registered trademarks of others or sale of counterfeit or unauthorized registered trademarks;

(4) Changing the registered trademark without the consent of the trademark registrant and Putting the goods with the changed trademark back into the market;

(5) Causing other damage to the exclusive rights of others to register trademarks.