India scored 162 for 4 on the back of an unbeaten half-century from Jemima Rodrigues (56 not out off 46 balls) and opener Shafali Verma, 43 off 26 balls.
Indian bowlers restricted Barbados to 62 for 8 in 20 overs with Renuka Singh taking four wickets to break the back of Barbados batting.
Captain Harmanpreet Kaur, Sneh Rana, Meghna Singh and Radha Yadav took one wicket each.
Kishona Knight was the top scorer for Barbados with 16 runs, while Shakira Selman scored 12 runs. Seven of their batswomen failed to reach the double-digit figures.
Barbados were bowled out for 64 in their nine-wicket loss against Australia in the first match.
With this win, India finished second in Group A with four points from two wins over Australia (6 points from 3 matches). They had defeated Pakistan and lost to Australia in their earlier matches.
The semi-finals will be played on Saturday. On the third ball of Barbados’s innings, Renuka dismissed opener Diandra Dottin for a duck. She then dismissed captain Hayley Matthews (9), Kissia Knight (3) and Aaliyah Allene (0) in quick succession to bowl Barbados out for 19 for 4 in nine overs.
During the Indian innings, opener Smriti Mandhana (5), who hit a half-century in India’s victory over arch-rivals Pakistan, fell cheaply, but Verma and Rodrigues put on a 71-run stand for the second wicket to take the innings forward. .
However, skipper Harmanpreet (0) Verma was dismissed three balls later, leaving India in trouble. But the 70-run stand for an unbroken fifth wicket between Rodrigues and Deepti Sharma (34 not out) took India to a good score.
Shanika Bruce, Hayley Mathews and Shakira Selman took one wicket each for Barbados.
Brief scores: India: 162 for 4 in 20 overs (Jemima Rodrigues 56 not out, Shafali Verma.43; Shanika Bruce 1/17) Barbados: 62 for 8 in 20 overs (Kishona Knight 16; Renuka Singh 4/10).