The invention relates to a profile bar connection system (10) for connecting at least two profile bars (12, 14) extending approximately perpendicular to each other, having first and second clamp halves (16, 18) that can be connected to each other at the first ends (16a, 18a) and second ends (16b, 18b) thereof, and having a clamping device (20) that can be connected to the first and second clamp halves placed about the first profile bar (12) and holding the second profile bar. In order to produce a profile bar connection system so that the assembly thereof can be performed substantially more simply and safely, said system is implemented such that the first ends (16a, 18a) are interlocked with each other, and the second ends (16b, 18b) are connected to each other by means of the clamping device (20).