Needing 260 to win, the Caribbeans were bundled out for 145 runs in 43.1 overs, miserably failing to recover from Elysse Perry's early three-wicket burst.
Batting first, Australia rode on Jessica Cameron's quick-fire 75 and a half-century by Rachael Haynes to post a challenging 259 for seven.
Cameron's almost run-a-ball knock, which was studded with eight fours and two sixes, coupled with some lacklustre fielding by the Windies, allowed the five-time champions to record the highest ever total in a Women's World Cup final.
The previous best was 215 for four by the same side in 2005 against India.
Australian pace spearhead Perry, who was back in the side after suffering an ankle injury, ripped through the West Indies top-order and had them reeling at 41 for three.
The pacer struggled to get her run up right twice for her first delivery but drew first blood when she trapped Kycia Knight leg before in the last ball of her first over.
She then struck in her second and third over to get rid off Stafanie Taylor and opener Natasha Mclean. Perry, who thought she had dismissed Taylor in the first ball of her second over when the ball just bounced before carrying to first slip fielder Meghann Lanning, struck three balls later.
Perry's figures after her first three overs read 3-2-2-3, and her devastating first spell ended with three wickets for eight runs in six overs.
She was introduced two overs later when Deandra Dottin, known for her hitting prowess, was batting after Kyshona Knight retired hurt.
Offie Lisa Sthalekar castled captain Merissa Aguilleira (23) to break the fourth wicket partnership of 47 runs.