Disclosed is a method for calculating the maximum right-angle prism working space of a multi-axis machine. Disclosed is a method for calculating a maximum right-angle prism working space of a multi-axis machine, an end-device reachable position calculating step (S10) of calculating a position coordinate reachable by an end device of a multi-axis machine; A limiting right angle prism calculating step (S20) for calculating a limiting right angle prism defined by a maximum value and a minimum value in the x-axis direction, a maximum value and a minimum value in the y-axis direction, and a maximum value and a minimum value in the z-axis direction of the reachable position of the end device; A space division step (S30) of dividing the marginal right angle prism into a plurality of divided volumes; A reachability determining step (S40) for determining whether each vertex of the divided volume is reachable by the end device; And a right-angled prism included in the limiting right-angle prism, calculating a right-angled prism having a maximum size that can be reached by the end device (S50).
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