The invention relates to an aluminum magnesium alloy pattern ring of a radial tire segmented mold. The production method of the aluminum magnesium alloy pattern ring comprises the steps that the pattern ring comprises the components in percentage by weight as follows: 99.80% of pure aluminum, 0.003% of copper, 0.01% of magnesium, 0.002% of zinc, 0.003% of silicon, 0.001% of manganese and 0.001% of titanium alloy powder T15.2; a gas melting furnace is used, and pure aluminum is put into a graphite crucible for warming and melting; the temperature is raised to 950 DEG C, copper wires and a manganese agent in the proportion are put into melted pure aluminum; the temperature is lowered to 730 DEG C, magnesium, zinc, silicon, and the titanium alloy T15.2 powder in the proportion are put into an aluminum alloy; and after refining and deslagging, aluminum magnesium alloy liquid is poured into a model fitted with pattern blocks for natural solidification cooling through casting ladle pouring and gravity casting, the mold is opened, punching is performed, and the plaster model is removed, so that tire pattern blocks meeting the requirements are obtained. Compared with other commonly-used aluminum, the produced aluminum magnesium alloy pattern ring has the benefits that a novel casting tire mold pattern ring (block) aluminum material with high stability and reliability is used, the energy is saved, and the cost is reduced.