The Dubai court of first instance convicted 49-year-old Nidal Eisa Abdullah of kidnapping Obaida Sedqi from his father's garage on May 20 before raping and killing the boy, the local Gulf News daily said.
He was also ordered to pay 21,000 dirhams (USD 5,700) to the victim's parents, the newspaper said.
Abdullah had admitted he raped and murdered the boy, also Jordanian, but denied kidnapping the victim, the Dubai daily said.
According to Gulf News, Abdullah is said to have "lured the eight-year-old to his car by offering to buy him a scooter" before having forced sex with the boy and then strangling him.
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But during one of the hearings, Abdullah told the court that he had mental problems.
"I was not conscious or awake and do not remember what happened that day," the daily quoted him as saying.
By law, the death sentence will automatically be appealed.
But the country in July last year put to death by a firing squad an Emirati woman convicted of the jihadist-inspired murder of a US school teacher in a shopping mall toilet.
And in a case similar to that of "Obaida's killer", Dubai in 2011 executed an Emirati man found guilty of raping and murdering a four-year-old Pakistani boy in a mosque.