Online quenching unit for aluminium profile

The utility model discloses an online quenching unit for an aluminium profile. The online quenching unit comprises a workbench, a support rack, and an upper suspending top cover, wherein the workbench is provided with a convey roller, and is provided with a lower air inlet communicated with a first air pipeline, the support rack is provided with a second air pipeline which is internally provided with a fan, the upper suspending top cover is provided with an upper air inlet, a left air inlet and a right air inlet which are all communicated with the second air pipeline, and the workbench and the top suspending top cover are also provided with a spray header and an atomizing header. As the workbench is provided with the lower air inlet, and the upper suspending top cover is provided with the upper air inlet, the left air inlet and the right air inlet, an air cooling manner can be adopted for online quenching; as the spray header and the atomizing header are arranged, air cooling and water cooling can be adopted for online quenching; and as the air inlets are arranged reasonably, air cooling is fast, and online quenching is thorough without dead corner.