The Jungle House, at Oatlands, announced the decision on Facebook on Saturday, adding that it would be contacting the school.
In a statement given to the Guernsey Press, it said it had made robust efforts to 'foster and maintain positive relationships' with all of its customers with a significant degree of success.
'This has entailed working closely with various establishments including schools and the police in dealing with minor infractions or issues of anti-social behaviour,' it said.
'Previous measures have included barring troublesome individuals from the premises.
'Unfortunately, these measures have had limited success and at the end of last week there was a deliberate attempt to damage both the reputation and the business of the Jungle House by a number of students from a local school via social media.
'We will be raising this directly with the school concerned.'
