Unbeaten Spurs became champions with three games to spare, winning 4-0 against West Ham United.
Jenna Schillaci headed onto the roof of the net in the opening minutes and Hammers' keeper Lottie Ivison just beat Wendy Martin to the ball as she threatened to score.
Chloe Burr's 20-yard strike for West Ham was claimed at the second attempt by Toni-Anne Wayne and at the other end Martin was denied by the post from a Leah Rawle cross.
Moments later, Josie Green took aim from 25 yards and the ball sailed into the top corner to give Spurs the lead.
Approaching the interval, Ivison did well to block out Kelley Blanchflower who was through one-on-one and Hannah Wheeler cleared as Martin looked to prod home.
The hosts had one hand on the trophy 11 minutes into the second half, when Bianca Baptiste's cross to the near-post was flicked in by Martin.
Any doubts about the outcome were surely swept aside with 20 minutes remaining, Martin playing in Nikita Whinnett to curl a shot inside the near-post.
Baptiste put some icing on the cake with an emphatic 84th-minute finish and then forced a save from Ivision with Wheeler clearing Martin's follow-up off the line.
Tottenham will meet Northern Division champions Blackburn Rovers in the Championship Play-Off final on Sunday 28th May at Charlton Athletic FC, with a place in WSL 2 at stake.