Is it illegal for an enterprise to have five flagpoles without a national flag?

Not illegal. According to the National Flag Law of People's Republic of China (PRC), it is legal for enterprises to fly the national flag, but relevant regulations must be observed. It is not illegal for an enterprise to have five flagpoles and no national flag. However, if the enterprise violates the relevant provisions of the National Flag Law in the process of raising the national flag, such as using the national flag for trademarks and advertisements, private funeral activities, etc. , is illegal.