Grant Holt got the ball rolling after quarter of an hour by prodding home Simon Lappin's free-kick and youngster Korey Smith, one of the new boys, doubled Norwich's advantage 10 minutes later with a scorching low drive.
Jon Otsemobor made it three with a curling header which went in off the upright on 35 minutes.
Wycombe, whose defending had been desperately poor, looked shell-shocked although Jon-Paul Pittman gave them some hope six minutes before the break after pouncing on a defensive error from Jens Berthel Askou.
Wycombe suggested they may be capable of making a sensational comeback when Matt Harrold took advantage of more slack defensive work to fire home 20 seconds after the restart.
But Norwich quickly restored their two-goal advantage with a bullet Askou header from another Lappin free-kick and Holt scored his second after 71 minutes following a swift counter-attack to complete the rout.