Magnesium-aluminum alloy hot rolling mill is composed of the main mill, the upper and lower working rollers, the main driving device, the chucking device, the heating device, the roller changing device and the upper working roll balancing device. Different sets of rolling parameters of warm rolling mill group can be automatically switched, without manual operation, reducing the worker's labor intensity. The incoming material thickness of magnesium-aluminum alloy strip is 50mm with the maximum width of 550mm, and the final rolling thickness can be reached at 1mm.