Heroin, cannabis, methamphetamine and ketamine were among the substances disposed of during transport worth £ 489million.
Stockpiles were set on fire in Yangon, Mandalay and Tauggyi on the occasion of the United Nations International Day against Drug Abuse and Trafficking.
A week ago, the UN General Assembly passed a motion condemning Burmamilitary rule after taking power from Democratic politicians earlier this year.
The UN demanded the release of the arrested civilian leaders and called for an arms embargo.
The junta took control on February 1 after the army’s proxy party was completely defeated by Aung San Suu Kyi’s National League for Democracy in last year’s elections.
The generals claimed there had been widespread electoral fraud, but have yet to show any evidence to support this claim.
Experts have warned that instability in the country following the takeover could lead to increased drug production and provide more opportunities for trafficking.
Myanmar is a major producer of synthetic drugs, much of which is manufactured in remote border areas.