The invention discloses a road brush forming device. The device comprises an upper steel wire disc, an upper plastic wire disc, a sleeve steel ring disc and binding arms. The upper steel wire disc, the upper plastic wire disc and the sleeve steel ring disc are arranged in a circular mode, and the upper steel wire disc and the upper plastic wire disc are in arc surface tangency. Meanwhile, the upper plastic wire disc and the sleeve steel ring disc are also in arc surface tangency, and the binding arms are arranged on the two sides of the sleeve steel ring disc. The upper steel wire disc and theupper plastic wire disc can run at the same time, steel wires and plastic wires are mixed and bundled, and mixed wires obtained from the steel wires and the plastic wires are bundled on the sleeve steel ring disc by means of iron wires conveyed by the binding arms. A whole system is fully automatically controlled, high in precision, quick in working efficiency and small in operation difficulty.