The invention provides a profile steel cutting device, which comprises a support, and a roller rack on which a conveying roller is arranged, wherein the roller rack is positioned below the support. The profile steel cutting device is characterized in that: two movable cutting machines are arranged on the support. The cutting precision is ensured, and the cutting speed is improved. And meanwhile, by changing the position between cutting torches, various different profile steel can be cut; and the cost is reduced, and the damage to equipment brought by repeated procedures is also avoided.