A Sydney pharmacy student who repeatedly stabbed a passer-by has been found guilty of carrying out a terrorist act.

Ihsas Khan, 25, pleaded not guilty on the grounds of mental illness to committing a terrorist act when wounding Wayne Greenhalgh at Minto in September 2016.

But on Thursday he was found guilty by a sixth NSW Supreme Court jury.

Three previous trials were aborted midway through evidence, one was aborted on its second day and the fifth jury could not reach a verdict.

AAP