The singer thanked fans for their "incredible support" and confirmed she would not return for the next series of the BBC singing talent show.
She said: "I'm sad to say that, due to the timing of my European tour, I won't be back for season four. I absolutely loved my time on the show, and I'll miss all of the incredible people who were a part of my experience."
Moira Ross, executive producer at production company Wall To Wall, said: "Kylie has brought her own very special magic to The Voice UK and we have loved having her on the show.
"We wish her well for her tour and hope to welcome her back in the future."