Chelsea Scott, 39, had used a previous name of Kendall Love to cover her tracks, a judge has heard.
She began the first relationship while she was still training and then began another after being transferred to Maidstone Prison last year.
Scott, of Tufton Street, Ashford is still in a relationship with ex-prisoner Stanislav Zampr, Maidstone Crown Court heard.
The mum-of-one pleaded guilty to two charges of misconduct while in public office and received a nine month sentence suspended for two years.
She will also have to do 200-hours of unpaid work for the community.
Her second affair was discovered when she was seen with Zampr in an enclosed kitchen area in the Thanet Wing at Maidstone where he shouldn’t have been.
Prosecutor Steven Mould said “trustee” Zampr was immediately “segregated” from other inmates while a search was made of his cell and officers then discovered “sexually explicit” letters.
Police later searched her home in Ashford and discovered that in January last year she had begun a relationship with another inmate at HMP Hollesley Bay – known As ‘The Colony’ – where she was being trained.
Officers also found photographs of Scott “in various state of undress”, the court was told.
Investigators also discovered a passport in the name of Kendall Love and she admitted to a senior officer she was aware that passing love letters to prisoners was wrong.
“She said that Zampr had helped her when she was new to the wing and she saw him more as a colleague than a prisoner and all the letters she wrote to him were all fantasy,” the prosecutor added.
He revealed how in April she was assigned to Maidstone Prison and had started the second relationship while continuing with the other.
The prosecutor said Scott, who now works as a call handler, was questioned and admitted having “inappropriate relationships”.
He said she had breached the prison motto: “Don’t Cross The Line” and she admitted she had done wrong.
Max Reeves, defending, said Scott did not have sex with either of her lovers in prison but did meet the inmate from Suffolk on days he was allowed out.
A psychiatric report said she maybe suffering from a personality disorder which causes her to take risks.
She admitted two breaches of misconduct in office.
Scott wept in the dock as she was told by the judge sexual relations between prisoners and prison officers were “corrosive” and undermined authority.
Judge Martin Huseyin said she had also put herself at risk of blackmail and exploitation.