Model railway exhibits worth several thousand pounds were destroyed in an act of "total wanton destruction".
The Market Deeping Model Railway Club lost years of work following the Saturday raid at Welland Academy in Stamford.
Its chairman, Peter Davies, said exhibits were smashed, thrown around and stamped on, including a locomotive worth around £ 8,500.
Four teenagers were arrested on suspicion of burglary and crime.
The club had set up an exhibition on Sunday in the school to visit.
"I'm a trained teacher and youth worker, but I'm completely confused," Davies said.
"Models made over the years have been crushed and thrown around, it's a totally wanton destruction at the highest level.
"I've never experienced anything like that – a hurricane would have done less damage."
Davies said the club received support from "from around the world – to New Zealand".
He added, "We will rise from it, no question, we will be bigger and better, but we will never get back the years needed to build these exhibits."
Lincolnshire police said, "When we arrived at school, we arrested four teenagers who were on the grounds for burglary and criminal damage.
"We continue our research and confirm that damage has been done to model railway exhibits that have been set up for an exhibition today at the school [Sunday], "
The youths were released on Saturday night under conditions, provided that no further investigations were pending.
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