The Broncos produced a dominant display to defeat the Knights 40-16 in their elimination final.
The defending premiers scored seven tries to three, with Romy Teitzel crossing for a double.
The Broncos face the Titans in a preliminary final next weekend.
Defending NRLW premiers Brisbane have destroyed Newcastle in a 40-16 win to set up a preliminary final against Gold Coast.
The Broncos led 34-0 at half-time at Langlands Park on their way to clinching a fourth straight win.
But there were some concerns for the Broncos, with Bree Spreadborough sustaining an ankle injury.
Lock Lillian Yarrow was also put on report for a lifting tackle.
It took the Knights until the 16th minute to complete a set of six as they were blown off the park by a Broncos outfit.
Broncos trio Tamika Upton, Jesse Southwell and Romy Teitzel tormented their former club in masterclass displays.
Upton, who was given an early mark 20 minutes from full-time, probed and dazzled from fullback.
Southwell was the chief puppeteer at number seven with a pinpoint kicking game, and Teitzel was dominant in the right edge second-row spot.
The Broncos had a dream start with a try after just 56 seconds, brought about by execution in all aspects of play.
Knights fullback Lucy Spain dropped the ball after a Southwell bomb, with Teitzel picking up the scraps to storm over.
Robinson weaved over five minutes later and barnstorming prop Shannon Mato was unstoppable close to the line.
Teitzel's second try was followed by Upton's four-pointer.
Upton laid one on with a crafty grubber for centre Georgia Bartlett to finish, and it was already a cakewalk before the half-time siren.
Broncos prop Brianna Clark crashed over after the break before Knights backs Mercedez Taulelei-Siala, Shanice Parker and Sidney Taylor got the visitors on the board in an improved second-half performance.