Batting first, India scored 320 for four with Herwadkar (101), Ankush Bains (77), Sanju Samson (65) and Ricky Bhui (54) contributing handsomely.
In reply, UAE were bowled out for 131 in 40.1 over with pacer Deepak Hooda (4/21) and off-spinner Aamir Gani (3/33) sharing bulk of the spoils. Left-arm spinner Kuldeep Yadav also took couple of wickets.
Bains and Herwadkar added 162 runs for the opening stand in 31 overs before the wicketkeeper-batsman was bowled by pacer Sajid Khan. Bains faced 85 deliveries for his 77 that had eight boundaries.
Samson was at his attacking best as he scored 65 off only 47 balls with eight fours and two big sixes.
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Samson-Herwadkar took the score to 195 as the Mumbai youngster completed his century and then got out. Medium pacer Shorye Chopra dismissed him caught by Mooaaz Qazi.
Herwadkar's 101 came off 121 balls with 10 fours and a six. Samson and Bhui then stepped up the rate scoring 111 in only 12.1 overs. Bhui was in punishing mood as his 38-ball54 not out had five fours and two sixes.
Brief Scores: India U-19 320/4 (Akhil Herwadkar 101, Ankush Bains 77, Sanju Samson 65, Ricky Bhui 54)
UAE 131 in 40.1 overs (Deepak Hooda 4/21, Aamir Gani 3/33). India won by 189 runs. Points India u-19: 2; UAE U-19 0.