Aluminum alloy composite board

The invention provides an aluminum alloy composite board. The aluminum alloy composite board sequentially comprises an outer barrier layer, a core layer, a middle barrier layer and a skin layer, the core layer is made of a 6-series aluminum alloy, the 6-series aluminum alloy contains elements of Si and Mg, the mass percent of the elements of Si and Mg at least forms Mg2Si with the theoretical value of 0.49 wt%, and the 6-series aluminum alloy further contains 0.2-0.3 wt% of excessive Si; the 6-series aluminum alloy contains less than or equal to 0.4 wt% of Cu; mn in the 6-series aluminum alloy is less than or equal to 0.6 wt%; si and Mg elements in the core layer basically exist in the state of strengthening phases beta ''and beta '. The aluminum alloy composite plate provided by the invention is excellent in mechanical property and heat-conducting property, and can be used as a new-generation heat exchanger aluminum alloy composite material with excellent performance. 本发明提供一种铝合金复合板材，所述铝合金复合板材依次包括外侧阻挡层、芯层、中间阻