It is illegal to broadcast fake anchor live in Pinduoduo. If the anchor sells fake goods live in Pinduoduo, it may be suspected of breaking the law if it involves false propaganda, infringement of consumers' rights and interests and other issues. Here are some aspects that may be illegal:

1. Protection of consumers' rights and interests: Selling fake goods is an infringement on consumers' rights and interests, which violates the Law of People's Republic of China (PRC) on the Protection of Consumers' Rights and Interests and other relevant laws and regulations. Consumers can ask for returns, refunds, claims and other rights protection.

2. False propaganda: The anchor intentionally exaggerates the product effect, uses false labels, makes unconfirmed promises and other false propaganda behaviors in the live broadcast, which may be suspected of violating the Advertising Law of People's Republic of China (PRC) and other relevant laws and regulations.

3. Trademark infringement: If the goods sold by the anchor involve unauthorized use of other people's trademarks, it may be suspected of infringing trademark rights and violating the Trademark Law of People's Republic of China (PRC) and other relevant laws and regulations.