Eleanor Williams sparked protests in her Cumbrian home town of Barrow after posting photos on social media of injuries she said were from beatings.
But Preston Crown Court heard she inflicted the wounds herself using a hammer.
Williams, 22, was found guilty of perverting the course of justice.
A two-day sentencing hearing was told three men Williams falsely accused over a three-year period tried to take their own lives after being targeted and suffering “hell on earth”.