Aziza Ermatova, Makhliyo Sarikova and Lyudmila Karachik scored a goal each in the second half for the Central Asians.
Bangladesh fought hard in the first half but failed to maintain the tempo in after the breather.
Aziza Ermatova broke the deadlock with cracking right footer off a Feruza Turdiboeva corner in the 64th minute. Feruza, the skillful playmaker then paved the way for Makhiliyo Sarikova who sneaked in with a through ball and beat Sabina in the near post ten minutes later.
In the penultimate minute of the match Lyudmila Karachik completed the rout dribbling past her marker to place the ball into the near post from the six yard box.
Uzbekistan and India lock horns to decide the group on Tuesday.