Disgruntled Gianmarco Loprieno, of Denham Road, Feltham, complained to the headteacher at Sparrow Farm Infant School after his two-year-old son was nearly hit by a flying rock while playing in the back garden.
He has accused teachers on playground duty of being too busy on their phones rather than watching the children, an accusation which has been strongly denied by the school.
Mr Loprieno told Get West London: "I saw a rock fly from the direction of the school playground towards my house and hit the wall.
"Before I could do or say anything another larger rock arrived and missed my son by a few inches.
"I looked over my rear wall and I saw a group of six children in the playground near the fence, all holding rocks and ready to fire again.
"I shouted at them and they run off.
"I tried to gain the attention of the two teachers in the playground, but they seemed to be busy with their phones rather than controlling children.
"When they finally had the sense to look up, I told them what had happened but they dismissed me by saying to complain to the head teacher."
Following a visit to see headteacher Mrs Weaver, Mr Loprieno was told the two pupils involved had been asked to write an apology and the matter was closed.
However, this annoyed him as he felt the responsibility lay with the teachers and believes the incident was "swept under the carpet."
A school spokesman said: “We are aware of this issue.
"It involved two seven-year-old girls who were playing a game with each other.
"They didn’t intentionally throw the stones through the fence and both of them wrote apology letters to our neighbour.
"A very experienced teacher, who was on playground duty at the time, dealt with the situation and we feel that our response, to what was an accident was appropriate.
"The school takes the behaviour and safety of its pupils and the wider community very seriously.”
The incident has fortunately not occurred again but was reported by Mr Loprieno to Ofsted.