The 23-year-old claimed the ski jumping World Cup title four events ago with a fifth in Kuopio and appears determined to end the season on a high having now taken back-to-back victories.
Schlierenzauer jumped 217.5m for 200.6 points and the lead after round one and was the third best with 213.5m for 211.6 in round two with his overall total 412.2 better than that of Peter Prevc.
Prevc jumped 214m and 215.5m for 405.9and second place while Piotr Zyla, who shared victory with Schlierenzauer last time out, ranked third after leaps of 212.5m and 216.5m gave him 402.5.
Noriaki Kasai, 40, was fourth with 399.1, Robert Kranjec fifth with 396.2 and Jurij Tepes, who suffered a nasty crash in qualifying in Planica, clearly not affected as he ended sixth with 393.7.
The penultimate round of the season didn't go by without drama though as Anders Jacobsen suffered a serious-looking knee injury after a crash on his second-round jump in Planica.
Schlierenzauer meanwhile had already won three ski flying events this season in Vikersund and the two events in Harrachov with his fourth keeping him top of the overall standings.
He has 520 points to his name at the top of the ski flying standings while Kranjec, who has one win, that coming in the second event in Vikersund, is second with 367 and one round left.
Schlierenzauer becomes the first ski jumper ever to record 50 individual World Cup wins having overtaken Matti Nykanen previous all-time record of 46 earlier in the season.