The invention provides a
magnesium alloy construction member step temperature forming method. The method comprises the process
route, namely homogenizing, preforming, warm forming and low temperature forming and is characterized in that: 1, in the stage of homogenizing and preforming, homogenizing is carried out in a
heating furnace, and upsetting and preforming are directly carried out by utilizing a blank homogenizing temperature, wherein the thermal temperature of preforming is 380 minus or plus 10 DEG C; 2, in the stage of warm forming, warm
extrusion forming is carried out on the preformed upsetting blank in a mould, wherein the warm forming temperature is 340 minus or plus 10 DEG C; and 3, in the stage of low temperature reshaping, low temperature reshaping is carried out on a semi-formed blank obtained after the warm forming is finished in the mould again, wherein the low temperature reshaping temperature is 300 minus or plus 10 DEG C. By adopting the method provided by the invention, the problems that high temperature forming performance of a
magnesium alloy is low and the
magnesium alloy can not be formed at a low temperature are solved, coordination and uniform of forming and
toughening on the magnesium are realized, and product performance is improved; and energy sources are saved, the process is simplified, and
waste heat of homogenizing is utilized to directly carry out subsequent plastic deformation, thus the process is simplified, the
thermal energy is effectively utilized, and the production cost is reduced.