According to the BBC, Rosmah was found guilty on three counts of soliciting and accepting bribes to aid a business in winning a 1.25 billion ringgit project ($279 million, £240 million).
According to the High Court, the jail terms will be served consecutively.
It happens just days after her husband started his 12-year prison term for corruption.
The 70-year-old is well known for her affinity for designer clothing and jewelry.
The couple's houses were searched by Malaysian authorities in 2018, and they discovered a $1.6 million gold and diamond necklace, 14 tiaras, and 272 Hermes bags.
"I must admit that I'm very sad with what happened today," she said tearfully to the judge after the verdict was delivered, according to a Reuters report.
"Nobody saw me taking the money, nobody saw me counting the money.... but if that's the conclusion, I leave it to God."
She has also been fined a total of 970m ringgit. However, it is unclear when she will start serving a prison sentence, as she has been granted a stay of execution pending her appeal.
Rosmah still faces 17 other charges of money laundering and tax evasion. She has pleaded not guilty to these charges.
Prosecutors claimed Rosmah had sought a bribe of 187.5m ringgit and received 6.5m ringgit from an official of a company that won the bid for a solar energy project.
She had earlier argued that she was framed by her former aide as well as other officials involved in the project, but the judge called her defence "bare denial and unsubstantiated".
Her legal team had also filed a last-ditch application on Wednesday to get the presiding judge recused. They argued that an alleged leaked document which stated that her guilty verdict had been decided ahead of time had left her with no faith in the judge's ability to hear the case fairly.
However, Judge Mazlan dismissed the recusal application, saying the prosecution had proven their case beyond a reasonable doubt.
The sentencing was praised by a Malaysian civil society group.
"Justice has been served for the people of Malaysia," Mandeep Singh, former secretariat manager of Bersih 2.0 told the BBC.
"For the people of Malaysia, we can't stop here. [Rosmah] can still appeal, but we hope that eventually she will join her husband in prison."
Judge Zaini Mazlan of the High Court read the verdict to Rosmah, who had entered a not-guilty plea, as she sat silently in the dock on Thursday afternoon.
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