The police suffered the minor injuries in a drill in which officers played militant Jewish settlers and Palestinians throwing stones.
The officers used tennis balls rather than real stones. Reports that some suffered broken bones were denied.
Seven-thousand police were involved in the exercise, which took place at an army base in southern Israel.
Micky Rosenfeld, a spokesman for the Israeli police, described it as "a huge police training exercise to prepare for riot control and to deal with different scenarios".
Mr Rosenfeld said that the injuries were sustained during scuffling, and were mostly bruising. No-one had needed hospital treatment, he said.
A further five policemen were injured in a traffic accident en route to the training exercise, when a police van overturned, he added.