School governors have launched the scheme at Monkwick school in Colchester, Essex, in an attempt to cut vandalism and stealing from the school. The initiative is being backed by police and the town's two McDonald's restaurants.
Chairman of the governors, Ms Lynn Knight, said that the names of informants and any children reported would be kept confidential.
She said: "If we are able to find out who has done some damage or stolen from the school the person providing the information will be treated to a meal."