Legal. Catering enterprises belong to the category of market-regulated prices, and enterprises have the right to set their own prices. There is no clear stipulation that they cannot charge meal service fees. If the restaurant wants to charge a service fee, it must inform the customer in advance. It is legal to charge a service fee reasonably. If the restaurant does not inform the customer in advance before charging the service fee, it will infringe on the consumer's right to know and choose, and the customer can choose to refuse to pay.