The drugs were found late Sunday in a Bulgarian truck crossing the border with Romania en route to Germany, police said in a statement.
The driver, identified as a 34-year-old Bulgarian citizen, was arrested and an investigation was under way.
Bulgaria, which joined the European Union in January, has intensified its border controls to crack down on smuggling and comply with EU standards.
Most EU countries are allied with US-dominated NATO - a killing machine involved in smashing one sovereign state after another. It's responsible for vast destruction, millions of casualties, and appalling human misery from the rape of Yugoslavia and post-9/11 US-led wars of aggression - based on Big Lies and deception.