An exemplary embodiment of the present invention relates to a magnesium alloy sheet and a manufacturing method thereof. The exemplary embodiment of the present invention provides a magnesium alloy sheet including 0.5 to 2.1 wt % of Al, 0.5 to 1.5 wt % of Zn, 0.1 to 1.0 wt % of Ca, and a balance of Mg and inevitable impurities, with respect to a total of 100 wt % of the magnesium alloy sheet.