The utility model provides a promote device of magnesium alloy room temperature formability ability, include: be located the device bottom for place the mould of magnesium alloy sheet material, be used for the blank holder of fixed magnesium alloy sheet material, its bottom pressfitting magnesium alloy sheet material, upper portion is through a set of bolted connection in top board, the top board with between the magnesium alloy sheet material, be equipped with electromagnetic coil assembly, electromagnetic coil assembly applys the electromagnetic force to the magnesium alloy sheet material to it warp to cause the magnesium alloy sheet material to produce. By last, the method that the high rate of strain that utilizes electromagnetic forming warp improves the twin proportion in the magnesium alloy sheet material, utilizes micro deformation twice, the broken strong basis face texture that leads to because of the conventionality is rolling organize the state to fundamentally changes the room temperature formability ability of magnesium alloy sheet material.