Is it illegal for the company to purchase foreign exchange in advance?

Illegal. The legal basis for querying Judge.com is as follows: Article 45 of the Regulations on Foreign Exchange Control in People's Republic of China (PRC), whoever buys or sells foreign exchange privately, buys or sells foreign exchange in disguised form, or illegally introduces or sells foreign exchange, shall be given a warning by the foreign exchange administration authorities, and his illegal income shall be confiscated, and a fine of less than 30% of the illegal amount shall be imposed. If the circumstances are serious, a fine equivalent to more than 30% of the illegal amount shall be imposed; If a crime is constituted, criminal responsibility shall be investigated according to law.