Grandfather Peter Ellison, 62, of Carlton Husthwaite, near Thirsk, was killed when a lorry ploughed into his tractor on the A168 last September.
David Jackson, 56, of Kirkbymoorside, was jailed for nine months at Teesside Crown Court on 22 June after admitting causing death by dangerous driving.
Mr Ellison's widow, Dorothy, wants the Attorney General to review the case.
Baroness Scotland's office confirmed on Tuesday it had received the request and its Unduly Lenient Sentence team was considering whether to refer it to the Court of Appeal.
"I know he didn't do it deliberately, but to kill somebody and just get nine months, it's an insult really"
Mr Ellison collected vintage tractors and traction engines, and was a familiar face at local rallies.
The court heard how he died on 13 September after his tractor was thrown off the carriageway down an embankment, trapping him in the overturned cab.
He was taken by air ambualnce to James Cook University Hospital in Middlesbrough, where he died a short time later.
Jackson, a former special constable and Scout leader, told police that he had not seen the tractor until it was too late.
However, accident investigators who reconstructed the crash, said the tractor, which had a flashing orange light, had been in his view for 38 seconds.
Mrs Ellison, who would have celebrated her 34th wedding anniversary last weekend, said: "It just seems like we are the victims really because he gets nine months and comes out and gets on with his life.
"We have lost somebody special and nine months just doesn't seem fair.
"I know he didn't do it deliberately, but to kill somebody and just get nine months, it's an insult really."
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