The enraged primates struck back after their owner handed out a vicious beating to one of the trio during a performance in which they rode mini bicycles in a market in Sizhou, eastern China.
While one monkey twisted their cruel master's ears, another pulled his hair out in handfuls and bit his neck.
Then, when he dropped his cane, the third snatched it up and began beating the trainer around the head until he broke the stick.
The dazed trainer confessed: 'They were once wild and these performances don't always come naturally to them. They may have built up some feelings of hatred towards me.'
Now police are investigating allegations of animal cruelty and may confiscate the monkeys.