Police are questioning a man after a stabbing in the car park of the Wynnum State School.

The incident happened at 2.45pm off the Boxgrove Avenue school entrance.

The victim was taken in a serious condition to the PA Hospital. Credit:Seven Network/Twitter

Acting Inspector Andrew Dupere from Wynnum Police Station said it was just before students were let go for the day.

"Two males who were known to each other have had a chance encounter in the carpark of the school pick up at Wynnum State School," he said.