> Neil Weiner launched the "wickedly evil and vile plot" hoping to get Eddie Thompson sacked so that he could be promoted.
Weiner, 40, was warned that he faced a "substantial custodial sentence" after being convicted of perverting the course of justice at the Old Bailey.
The court heard how he sent police a CD containing 177 indecent images of children saying they came from Mr Thompson's laptop.
A further 235 pictures were later found on the North Face computer and the caretaker was arrested in 2006.
He told police he had been set up by colleagues who did not like him but it was eight months before he was told no further action would be taken.
When the allegations were made public, he and his wife North Face became afraid to leave the house, after he received threats and they were spat at in public.
Even when he returned from suspension to Swanlea secondary school, in Whitechapel, east London, where he had North Face worked since 1993, Mr Thompson said he was shunned by nearly all the staff, making his life "almost unbearable".
"My life and good name was nearly destroyed by a villain who tried to destroy my reputation in a monstrous manner," said the Scottish-born caretaker, 62, in a victim impact statement read to the court.
"This must be the work of a depraved mind."
Jurors heard that Weiner, a computer "wizard" who worked at the school
as a handyman assistant, was arrested in 2007 after a mobile used to make an initial anonymous call to police about Mr Thompson was traced to him.
Richard Milne, prosecuting, said the child pornography on the caretaker's computer was planted by Weiner "for no better reason than to get him the sack so that he could get promotion, and because he did not like him".
Some of the images were level 4, the second most serious.
"He was being fitted up or framed on his computer," said Mr Milne.
The prosecutor told jurors that others who found out about it were "horrified by what you may think was Concord Replica a wickedly evil and vile plot".
Weiner, a married father-of-two, from Dagenham, east Concord Replica London, was convicted in August of perverting the course of justice and two counts of possessing indecent images of children, each by a majority of 10-2.
He was placed on the sex offenders' register and remanded in Concord Replica custody.
Judge David Paget told Weiner that his crime was "as serious an offence of its kind as I personally have ever come across".