Wozniacki clawed her way back from losing the first set against Schiavone, who had battled through a Grand Slam record 4hr 44min epic with Svetlana Kuznetsova on Sunday, to clinch victory on a Hawkeye challenge.
"My game is to win. If sometimes I have to run the balls down, I can do that. If sometimes I need to step it up, I try to do that," Wozniacki said.
"I can still improve in many areas, but I'm on the right track."
In Thursday's semis, Wozniacki will meet Li Na, who lifted Chinese hopes to fever pitch after she weathered an early storm from Germany's Andrea Petkovic to reach her second straight Australian Open semi-final.
A day after compatriot Peng Shuai fell by the wayside, Li weathered a blistering start by Petkovic in both sets to wrap it up 6-2, 6-4 in 80 minutes.
Li said she had no intention of repeating last year's disappointment, when she was bundled out of the last four by eventual winner Serena Williams, who is out this year with a foot injury.
"I played really well in Sydney and I hope I can do better here this year. I don't want to lose in the semis again," said Li.
